Malicious PDF — malware analysis report

Static analysis result for SHA-256 872f64d9f05e7df1…

MALICIOUS

PDF

82.6 KB Created: 2021-02-25 06:23:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7ad84eca4f33c3d16d5da61be613c966 SHA-1: 991c485f7202d79d90758bdd2f766f11ec33fe87 SHA-256: 872f64d9f05e7df1184f71c468caddd1e899947e91d767cdd7c74cac3cb201f7
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 0.9997

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.
  • 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/123?utm_term=citizen+eco+drive+skyhawk+titanium PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423188/normal_6032d74db935a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446283/normal_5ff0d1a3a1749.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374696/normal_6008d03538709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527237/normal_6012c2b182d5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_600fc03d5e4bc.pdfIn PDF document text
    • https://kogozifimasubi.weebly.com/uploads/1/3/4/1/134131491/viginuvujipozu.pdfIn PDF document text
    • https://cdn.sqhk.co/xilelawemu/hejaYgf/free_christmas_coloring_pages_by_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/dhftXie/zidudivur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477373/normal_601bfaf8a4dd0.pdfIn PDF document text
    • https://sabadefupi.weebly.com/uploads/1/3/4/3/134345863/488093bbdf6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414172/normal_60248e1d93712.pdfIn PDF document text
    • https://cdn.sqhk.co/xedomobedusi/haNLw1J/formula_2_silverstone_2020_results.pdfIn PDF document text
    • http://taptopbot.com/gbc._emu_apk_1._5._37_downloadjv7zi.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/pubojujuka-kefuvub-zekebopiwib-dekuxuvaj.pdfIn PDF document text
    • https://cdn.sqhk.co/dezosanag/ic5jiji/dream_girlfriend_mod_apk_1._0._31.pdfIn PDF document text
    • https://sikefenuvip.weebly.com/uploads/1/3/4/0/134012601/teduweg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gonasidupij/74404929770.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/83896220055.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/bootstrap_dashboard_template_w3schools.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/pandora_s_tower_wii_iso.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 5420 bytes
SHA-256: cee5ffcb35479f85593f962b7676bddf057eba1141d0b6627abdb6e3b14ee293
font_01_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 10872 bytes
SHA-256: e38e6294a18ceb9ed9dabdc9c46d608bb3efeb4dbd817eb27510abb8b2889f8c
font_02_sfnt_off00012f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F06 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3