Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e52c6481bf7d10f…

MALICIOUS

PDF

102.6 KB Created: 2021-03-02 13:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c76c42076e5c8199d70117f766b8f2df SHA-1: 3f3bed5bea75a3b33514cd9c8c181568d5db3dad SHA-256: 8e52c6481bf7d10f746a555d55bfc5a877b422c210ef7174ccc864ebabc24692
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple critical heuristics as a malicious redirector and link farm. It contains numerous links to disposable domains, suggesting an attempt to manipulate search engine rankings or distribute further malicious content. The ML classifier also strongly indicated maliciousness, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dafemum.ru/123?utm_term=can+iphone+work+as+tv+remote In PDF document text
    • http://titoto.xyz/tiraneworuzupifizepajomfp14.pdfIn PDF document text
    • http://nanolenka.xyz/autosar_adaptive_platformdksti.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/7A2PSHg/wajotarofulodegijokavog.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/hfJSLgf/45146631099.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371508/normal_5ff61f1e04a35.pdfIn PDF document text
    • http://cccckkkkkdd.space/359400295159hoog.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/TYgjp1h/dokowige.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417536/normal_5fcaa03868739.pdfIn PDF document text
    • https://mufuwavujove.weebly.com/uploads/1/3/4/0/134042856/sogoxag-tegazopubofom-dekaf.pdfIn PDF document text
    • http://igcopyrightforhelps.com/psicologa_ideologa_y_ciencia_braunsteinns346.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/ibMxjN1/wimofiwosupufe.pdfIn PDF document text
    • http://beach-fruit.fun/44341981565fvdri.pdfIn PDF document text
    • https://zifekibovaliw.weebly.com/uploads/1/3/1/8/131871714/5200917.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465133/normal_5ff14f129d80e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_600cc7bb5a18b.pdfIn PDF document text
    • https://newomuzupigew.weebly.com/uploads/1/3/4/4/134468212/2358cc.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/0hjhitt/dujomibuxinafomegakad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_603dc350e7528.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoxoka/fzihXgh/fluid_live_wallpaper_iphone_8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00012472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12472 7232 bytes
SHA-256: 44528f59779cd4e37b1ffbe586ee8980b2340a21a9327d2f6f37321f243851a3
font_01_sfnt_off00013ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE9 5148 bytes
SHA-256: 946324b83c5d07acc5ac397bb8e94f612983c86d4868ca882d98caf4ac0c90e7
font_02_sfnt_off00014e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E56 12444 bytes
SHA-256: ba7e668172ff0607ee3df948b702f6850a7afa7426c2581db804a680e81621bf
font_03_sfnt_off000177c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177C4 16028 bytes
SHA-256: 3e66ce8c90719045bf8f6c8d5f716325bbce29c89c8399c9e71e7e90b46a9b16

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