Malicious PDF — malware analysis report

Static analysis result for SHA-256 828b0cc2e482b5ec…

MALICIOUS

PDF

91.8 KB Created: 2021-03-19 21:49:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 080cbaea3d161f7f574ef6f5f026d22f SHA-1: d733fb628838d04449284401cf3359113a0ff18d SHA-256: 828b0cc2e482b5ecd62445c07ba109d486e5daad6fba4c668d3f1a44f71fa73a
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing a large number of external URLs, many of which point to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=peavey+bandit+112+solo+series+scorpion+equipped PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384642/normal_601b504c65d69.pdfIn PDF document text
    • http://selectgetc.top/85778290387zaytl.pdfIn PDF document text
    • http://bnl-jobs.com/91179416949ytn2j.pdfIn PDF document text
    • https://cdn.sqhk.co/jojipimuve/XLMqug5/belted_topstitched_jumpsuit.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/idwihgc/any_mobile_number_call_details_online_without_otp.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/fjche8G/earth_now_app.pdfIn PDF document text
    • http://byseles.xyz/tavalufipgw3z4.pdfIn PDF document text
    • http://dietnatur.fun/html_link_hover_text_color4qgtd.pdfIn PDF document text
    • http://instapriz24.site/buck_converter_circuit064u3.pdfIn PDF document text
    • http://j3vnci4.xyz/auto_parts_apprenticeship0xghi.pdfIn PDF document text
    • http://aydym.club/how_do_you_build_a_shooting_table54la5.pdfIn PDF document text
    • http://com-servers.online/what_are_different_types_of_version_control_systemsajdd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491169/normal_6027f463727be.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/vTjdjca/nexabifebipojadema.pdfIn PDF document text
    • http://vinnipoh.space/pisawukofibejenagsef0r.pdfIn PDF document text
    • http://rating-bookmaker.ru/93479120218u4q62.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/Lnhgi3H/41348260291.pdfIn PDF document text
    • http://praktika-ingenieur.com/xuserutebifuvozijivikifuihjjv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_49bcd201dbbf44e4ab1158078b44fc7c.pdf?index=trueIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_dc7b73b0976d4f048144f8479c21f6e8.pdf?index=trueIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_507ab1bd4a5a46438152b12dc5da1f27.pdf?index=trueIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_19f05c47547f429399777d22d8e046d6.pdf?index=trueIn 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_off00012699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12699 5680 bytes
SHA-256: 33dd21ddbc77c61e62a451b757c9cadeacf3e152a4013c5c27f61ecbc191729f
font_01_sfnt_off00013a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A02 11372 bytes
SHA-256: 9222bbc628cfe75b202fdb0a4697fea7595c97172d600d73c4e8fc78140e3021