Malicious PDF — malware analysis report

Static analysis result for SHA-256 70934966df993fa2…

MALICIOUS

PDF

71.9 KB Created: 2021-05-11 12:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f8395d84fe217d6fd6424979092e9c2e SHA-1: db9d3540210755c4378a6e6bf81014aac2212734 SHA-256: 70934966df993fa26a00baa60ea78fd65425f84eb4c90de7b16658df9722aace
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 0.9998

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://bologen.ru/strik?utm_term=social+psychology+10th+edition+kassin+ebook PDF link annotation
    • https://kuvezuwuziteb.weebly.com/uploads/1/3/4/3/134388010/navekufebewofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448550/normal_6026c257cc0ee.pdfIn PDF document text
    • https://bukudemedu.weebly.com/uploads/1/3/1/4/131483547/2488862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482402/normal_605302237818e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_6011de3e49041.pdfIn PDF document text
    • https://gujidasudaximuv.weebly.com/uploads/1/3/4/3/134384457/76159acd0.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_603ec0132b7d9.pdfIn PDF document text
    • http://ravitidi.22web.org/migebo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420586/normal_5fca979977d3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444643/normal_600b2ee435c28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_6019a069835e4.pdfIn PDF document text
    • https://losirasi.weebly.com/uploads/1/3/0/7/130738883/tutiwimosutut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476420/normal_604cf24d2f09d.pdfIn PDF document text
    • https://notilapixoto.weebly.com/uploads/1/3/4/3/134397855/d4e15d23f4852.pdfIn PDF document text
    • https://muxetomanudone.weebly.com/uploads/1/3/1/4/131406273/e777f4c.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/Z6JhEmL/22233621422.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabaxaroxofujo.epizy.com/allegory_in_animal_farm.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_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 5840 bytes
SHA-256: 9ccf8fe1aa3f3f6083caf3b03f98fa754c2f9c9080ec4f9d3dd931fab2b24fea
font_01_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 10664 bytes
SHA-256: 7148be99e414590c8d59b1a7daa10c74847678b43c6e2f0df8f4bc7af85c41a4

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