Malicious PDF — malware analysis report

Static analysis result for SHA-256 82dcec0aea678596…

MALICIOUS

PDF

88.9 KB Created: 2021-03-22 07:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c220b888a77af9d34b3e7a3e0159ebdc SHA-1: b06d488ff684aaedd9577b14a1d1899ab732d496 SHA-256: 82dcec0aea678596b4bb839b8bbbc340f7f5250b578d4bdac5cb33d18e51ad3c
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam campaign. The presence of a 'reminder email sample content' in the document body, combined with heuristics like 'PDF_SEO_LINK_FARM' and 'SE_URGENCY_LURE', suggests a phishing or malicious redirection attempt. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to lead users to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/wix?keyword=reminder+email+sample+content PDF link annotation
    • http://lnstagramcopyrigtservice.com/xofivekak1i2qt.pdfIn PDF document text
    • http://all-casino.xyz/ted_dekker_the_forgotten_way_review40h0e.pdfIn PDF document text
    • https://bapamebitisetup.weebly.com/uploads/1/3/4/3/134325238/zimajazodo.pdfIn PDF document text
    • https://detabifaf.weebly.com/uploads/1/3/1/4/131436978/dagikutowubelu_lusuzevidovu_lidewobibubob.pdfIn PDF document text
    • http://kifudinufas.22web.org/dopagomow.pdfIn PDF document text
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/nexojem.pdfIn PDF document text
    • http://itdiscount.info/kaxofufiwerivapijobirulannu4e.pdfIn PDF document text
    • http://lenusabipowezo.getenjoyment.net/tulufabagiboxupilu.pdfIn PDF document text
    • https://nefufepaxesa.weebly.com/uploads/1/3/1/4/131453268/xasoravufe.pdfIn PDF document text
    • http://arenaprobet.com/pezamagiwa8ljw1.pdfIn PDF document text
    • https://ludutaxe.weebly.com/uploads/1/3/0/8/130814402/nemuze.pdfIn PDF document text
    • http://siondez.ru/febojizakiwegobr0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_a92b5d8b62364b78b90b467fc3a6985b.pdf?index=trueIn PDF document text
    • https://dc5983eb-04eb-4341-be6e-5f763cf8c8d0.filesusr.com/ugd/979c04_a36cdb7350024756a0776e9ae06eacb9.pdf?index=trueIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_124968541c0540679b1e866b5cdb81ac.pdf?index=trueIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_f6e2cfd44d954055bc2d46c5d399d17f.pdf?index=trueIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_a7124d753f8b497ea805f3038a76530b.pdf?index=trueIn PDF document text
    • http://ranitirunom.myartsonline.com/company_profile_design_template_free_download.pdfIn PDF document text
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_5dbb624a6921455cb15cd0f956821237.pdf?index=trueIn PDF document text
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_eb2496d52eed4f9cbb21fbd77f392aa8.pdf?index=trueIn PDF document text
    • http://lodagid.epizy.com/87873412092.pdfIn PDF document text
    • http://bafuwujix.atwebpages.com/catching_fire_full_movie_online_free_123.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_3a1bb3212f1d4381ba9982b7370fd283.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 5228 bytes
SHA-256: 8928c84ada62a3106a78d01a6899305147174acf7e4c55b28c1e9af8efc8c18f
font_01_sfnt_off00010ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD9 2952 bytes
SHA-256: 670066f0efc93e471bcd69833d981f6e2eb60892041ca01c35af6cf56a2f0b53
font_02_sfnt_off00011771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11771 11344 bytes
SHA-256: 51c379b114711c3ba695b76e0b56dad06a13b80d2fd2e1983be127dc9b7fa388
font_03_sfnt_off00013e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E07 16344 bytes
SHA-256: dc620336aa769c766927a552749f6283a30952bf3238451f386faf844582b0a6

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