Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc93c4729b6ab223…

MALICIOUS

PDF

106.9 KB Created: 2020-12-24 04:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 557ba84f09040b0c8e8a39132bfae328 SHA-1: b9eb811f4e07dd8c42e206f84e54faf80552f234 SHA-256: dc93c4729b6ab223170402209c103169dbac93f91680ee815165924073c3a1fc
216 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to a redirector hosted on weebly.com, designed to impersonate Microsoft for credential phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://vewekazetuxif.weebly.com/uploads/1/3/1/3/131379326/tavas_lemijaxosixapi_zofusudelu.pdf.
  • 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://traffset.ru/strik?utm_term=runescape+wiki+quests PDF link annotation
    • https://vewekazetuxif.weebly.com/uploads/1/3/1/3/131379326/tavas_lemijaxosixapi_zofusudelu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381738/normal_5fde86406e9d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479454/normal_5fdc552edc816.pdfIn PDF document text
    • https://cdn.sqhk.co/sakixowofeg/RZr0iPn/insect_repellent_sound_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wuluzajiroz/eFRRoie/burunisonojodijan.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/gigh9hh/11454002032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_5f9e91ab68757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452154/normal_5fa1c465331f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5fc0d2b979354.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/hDhbtif/how_to_draw_a_simple_ice_cream_sundae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d4541fc-dfe9-4263-b4fe-58af7103eeae/7255110930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3073177e-15df-409b-9bb2-4f9d2b6fd49e/xukevuxetosulisaxemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbeb1314-f597-4736-8731-8f272aab5b90/54426693925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deaa0677-cba7-46f5-b489-b62289143c26/zutoxazafadedisix.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001617f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1617F 5088 bytes
SHA-256: e426e2a80b5dbb032a4e68aecf15110a723cb82596099cb716cbfbdd94829eb1
font_01_sfnt_off00017308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17308 13644 bytes
SHA-256: 2538b57f0470060a8c239f96a696383e1ec3e36ad57992223e5da0d4a992d196

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