Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f79fd6ebbb2eab9…

MALICIOUS

PDF

74.4 KB Created: 2021-03-22 05:05:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ada9777404425dd218ccf344422c8319 SHA-1: 3224cecffe731800e1bb8d3c118a6900c7784082 SHA-256: 0f79fd6ebbb2eab9d94c6e2560be87f3a37dbbbf3becab9dde9c889cdcbdc711
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://xezojetit.ru/123?utm_term=online+enrolment+form+template PDF link annotation
    • https://filududo.weebly.com/uploads/1/3/5/3/135390237/9a817426c8a9767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_604e7b91a9570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_604f57f8205b0.pdfIn PDF document text
    • https://toxuweraf.weebly.com/uploads/1/3/4/1/134108638/jupugufik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_605241e3b6752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375907/normal_602a26beadea9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405419/normal_5ff50b9d88e90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402501/normal_5fee32dcf2144.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/how_to_write_group_planning_exercise.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471253/normal_5feb3d8f002aa.pdfIn PDF document text
    • https://mutebomex.weebly.com/uploads/1/3/2/7/132740724/1226322.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/61045564902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426257/normal_60514b32ca492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382778/normal_602e1d7629f27.pdfIn PDF document text
    • http://desokore.medianewsonline.com/8918805237.pdfIn PDF document text
    • https://sufupixugopibo.weebly.com/uploads/1/3/5/3/135316623/8785120.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_c0dadeb42da847d38cc3bf6081d85517.pdf?index=trueIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_d76a5d77263b469d9b7724964a6b00a6.pdf?index=trueIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_29469a906d56484cbe7a166bb8fde0b5.pdf?index=trueIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_c4ba2ce31272448a8dfb921a1db0a646.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 4896 bytes
SHA-256: 9cf25f84d8f9b3e2f031acc2606047762b0c1e8f106e3dcd2712d6e826cc4363
font_01_sfnt_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 10508 bytes
SHA-256: bbd7a426a7c29c2b1810f7da0d1b893dbffd3156b2cda4aa7d68a2330b8aadcd

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