Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e859cc22d9e239…

MALICIOUS

PDF

80.3 KB Created: 2021-03-17 08:12:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6921eac8de95a841b8b54fb40f926ee5 SHA-1: bdb3be0864ea5206512b6ed7bf7903f9350ddc6d SHA-256: 19e859cc22d9e239e67b5e324a190ed9c34c9b55850ce64d30d88342b3a3dfac
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/123?utm_term=osrs+fletching+guide+calc PDF link annotation
    • https://dexajaxalujum.weebly.com/uploads/1/3/1/8/131857565/153827.pdfIn PDF document text
    • https://wakaxizuso.weebly.com/uploads/1/3/5/3/135322555/6ef9ee2da734f2.pdfIn PDF document text
    • https://wamogipoko.weebly.com/uploads/1/3/0/7/130739383/6603294.pdfIn PDF document text
    • https://ralugegab.weebly.com/uploads/1/3/4/8/134888835/8c02bbe1b9.pdfIn PDF document text
    • http://detomebokiv.iblogger.org/accp_guidelines_anticoagulation_pulmonary_embolism.pdfIn PDF document text
    • https://cdn.sqhk.co/tozerutiwezu/hfjbpHV/5885697326.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/fadesujiso.pdfIn PDF document text
    • http://lezofifividex.scienceontheweb.net/depudigimakumagu.pdfIn PDF document text
    • http://wivevadevenumet.mywebcommunity.org/bostitch_18_gauge_brad_nailer.pdfIn PDF document text
    • https://cdn.sqhk.co/sogunixe/gEhbiB4/ice_cream_truck_for_sale_craigslist.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kivozusemu.atwebpages.com/the_algorithm_design_manualdrive.pdfIn PDF document text
    • http://mipuvofelope.epizy.com/zevikufokijizupetita.pdfIn PDF document text
    • http://xegaweripe.epizy.com/rewumimubabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d86bc9b4-e138-4429-aaa7-26ad64e6d75a/75545402250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60d1f6e1-f46f-409a-9594-51c987372d24/tawapilamopuwobazob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a6b6a96-6d4f-4284-a7f1-f878202416ab/wogenukanufebinuxudezun.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_efb2ecb4536a4b90a66bba5dd74aa594.pdf?index=trueIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_624bb1b1e42e416d84cec01eb66c1aa2.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_0584b87e744440e99a0455b37e240823.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_d2c1ce7805fa400f8e9a92d8cc7d1947.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8699c875-2f22-4c6b-bab3-bc9b86cff493/sc_dmv_schedule_driving_test.pdfIn PDF document text
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_e29d548921a5455eb1e6f24d7683cec7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c219a7a-06dd-495d-89fc-ebbf5ccda1b9/92481005529.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 5308 bytes
SHA-256: 569a10fa87809bc813a99749e8e0b98dafcaa7769b8745d2aa347fccc751b383
font_01_sfnt_off00010fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 10516 bytes
SHA-256: 8a9be8580e82e8a5a5cec63df62b04f49806963297f31ceee7ca61533ebfcd40