Malicious PDF — malware analysis report

Static analysis result for SHA-256 5787881ff1b0188a…

MALICIOUS

PDF

96.5 KB Created: 2021-03-04 17:14:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a5f9d1ae4a8c3aeac943c1bb1f877bbc SHA-1: ef83ce6163734eef9705bd6af8c3de9e7e4f8060 SHA-256: 5787881ff1b0188a84f06cc71efb4e70202babb7c5683b6fbf81608705bd1fa4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://vilenefex.ru/wix?keyword=geometry+chapter+2+extra+practice+answers PDF link annotation
    • https://terulupi.weebly.com/uploads/1/3/1/4/131406892/komizojovom-gudorudanike.pdfIn PDF document text
    • https://cdn.sqhk.co/nunagike/igLgjmO/kujofevelebajexira.pdfIn PDF document text
    • https://tegidaweriwasul.weebly.com/uploads/1/3/1/4/131483440/3877531.pdfIn PDF document text
    • https://senaduwofajix.weebly.com/uploads/1/3/0/7/130775021/zavasofafisopi.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/BenUWhe/word_scramble_puzzles_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/ggzy9hh/company_of_heroes_2_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/rapurakoke/hgd3gdx/nilewovewukiwewitiligosiz.pdfIn PDF document text
    • https://cdn.sqhk.co/laripikiwafo/lNyTgiE/zara_sale_dates_2020.pdfIn PDF document text
    • https://vodemilofokuse.weebly.com/uploads/1/3/4/2/134235674/vujapisaxexosewa.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/GigxBjb/my_talking_angela_eyes_zoomed_in.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_66784175d81949488474562777d356db.pdf?index=trueIn PDF document text
    • http://wifudozakiteg.epizy.com/sapekepi.pdfIn PDF document text
    • http://vuzosade.epizy.com/arcgis_10._5_with_crack.pdfIn PDF document text
    • https://734bf83f-2de9-4e28-bed8-2c4a7abe9427.filesusr.com/ugd/fc3b0b_86aee1bba9e74006a7a83ce7f77bd186.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_e55c2bb1967d4f0fae4dac11a058ef98.pdf?index=trueIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_c1a9a47ad1514f238caa4df6a2523145.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_fe10d72210d64e97bab012c4e0424fe5.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_off00011b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B01 2992 bytes
SHA-256: 22ad9557aa66b68f196aca4f9db134abfda5e6b00dccc3d1b4e7698c1d123f08
font_01_sfnt_off000125b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 5564 bytes
SHA-256: 4adf6a2d1590b965d5c56e448fb6ee40a13a1af392fa706230c249a37e44bdbf
font_02_sfnt_off00013892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13892 11088 bytes
SHA-256: dde2aef54fc43a75c04819cc833cafc75b4dfefd003ca0b5945fa89cbd5f44bd
font_03_sfnt_off00015ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA9 16164 bytes
SHA-256: 4b52fd5da643d9c08cc0a86f773b2f024e3274f3f861dfcac100db1ef433cf06