Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0f683eadac257a…

MALICIOUS

PDF

77.3 KB Created: 2021-02-28 19:20:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: efdf7ad5d97b9fca1f9e58252099c607 SHA-1: 142325c33289abce49ae877fd4091f162a6c704a SHA-256: fd0f683eadac257a378a641e2a6fcfc8434525d67a7c7b284017ef37eb74f73f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or malware distribution.

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://fokemale.ru/strik?utm_term=hampton+bay+universal+fan+remote+instructions PDF link annotation
    • https://cdn.sqhk.co/jimumakevaji/Xjohiib/chinese_kung_fu_movies_90s.pdfIn PDF document text
    • https://dusonibegoxat.weebly.com/uploads/1/3/1/3/131380688/samexurad.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/igghqgi/3405761248.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/cjaljj9/58853943646.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/fqPjhdF/58489090245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405208/normal_6037144bbe35a.pdfIn PDF document text
    • https://cdn.sqhk.co/mimufedu/Zuhh1ig/ragdoll_battle_simulator_mod_apk.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/godapakefixabudiwanif.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/72829436077.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/saroso.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxopejitin/hgRV7jd/arenal_volcano_eruption_1992.pdfIn PDF document text
    • https://cdn.sqhk.co/libabafo/m2bPij3/craft_guide_1._12._2_mod.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/64780741095.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/kizotudi.pdfIn PDF document text
    • https://bekefipupo.weebly.com/uploads/1/3/4/0/134096026/kapefow-mojebubix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mipizaju/dd_3.5_wizard_spell_book.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_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 5424 bytes
SHA-256: 716fbb3fad2ecb09a8a85456b81a62c699d1566d6c7c15580b157ba8dbea01c5
font_01_sfnt_off000102eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EB 10960 bytes
SHA-256: ab5f3f59b2d31264bb35f51b0de2c8e4d675ccc5b74920c4ab32a42b7ba4f58c

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