Malicious PDF — malware analysis report

Static analysis result for SHA-256 597c08d5423ff9c6…

MALICIOUS

PDF

121.8 KB Created: 2021-03-21 09:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1ab6a17b62d61e4ad47be7178b04f596 SHA-1: 807b5712660cd66cf7138bad8644542628d883c1 SHA-256: 597c08d5423ff9c6514c64d41c55917d5133c9a52669958292e00a21ca600a79
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9989

Heuristics 7

  • 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.
  • 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
  • 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://dafemum.ru/wix?keyword=apex+battle+pass+release+time PDF link annotation
    • https://cdn.sqhk.co/xizemeginu/5ij1Dgi/blue_sky_squadron_kairosoft.pdfIn PDF document text
    • https://vugovarekuluf.weebly.com/uploads/1/3/1/6/131607096/9940895.pdfIn PDF document text
    • https://cdn.sqhk.co/naruxibe/ia9Uu9i/tifavakum.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/ib24gWa/75614729298.pdfIn PDF document text
    • https://cdn.sqhk.co/bidusowo/P55Jhfn/roku_tv_smart_guide_not_working.pdfIn PDF document text
    • http://nexefugo.iblogger.org/46164895835.pdfIn PDF document text
    • http://famojefefe.iblogger.org/52382889.pdfIn PDF document text
    • https://vefavufarexuba.weebly.com/uploads/1/3/4/3/134315694/4886071.pdfIn PDF document text
    • https://jenisevemib.weebly.com/uploads/1/3/1/0/131070602/4104572.pdfIn PDF document text
    • https://cdn.sqhk.co/lunosupi/hdhe3jf/black_friday_deals_2019_walmart_xbox_one.pdfIn PDF document text
    • https://xedububedopo.weebly.com/uploads/1/3/0/7/130740082/6087395.pdfIn PDF document text
    • https://felixitu.weebly.com/uploads/1/3/4/0/134012625/jimidolapipomoji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_b61b04fb77fd451ea93342694dda90e9.pdf?index=trueIn PDF document text
    • http://kapilijugewi.rf.gd/23650054240.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_b375cf55c57d4fb4969c526fdd298a01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/wakelozapedagowede.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/zoxoziridanewudeja.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/51940616382.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_f35cabe2ecdf493cbe82fc4196fb9093.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/maxupab.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_b3bd0990d6be4d97ab5e309afdae73cf.pdf?index=trueIn PDF document text
    • http://nilikimapineti.epizy.com/business_information_systems_masters_canada.pdfIn PDF document text
    • http://suxanovovogemi.rf.gd/pulipevabideg.pdfIn PDF document text
    • https://ac6a5e95-3fab-4d4b-a7e7-0ef4c71e5929.filesusr.com/ugd/32c278_b11701220ef94253bf171d2810db4f1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vojapu/cuales_son_pronombres_relativos_en_ingles.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_off000193ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193CA 5164 bytes
SHA-256: 4606c008c32d7ae39eeb9a7dcb1979fdefca885e8319beca8d0ee56fc24ea78a
font_01_sfnt_off0001a538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A538 1912 bytes
SHA-256: 3cac7dd337beae05a51cedc8ab4137ff3cd8d7da0be7140b8775b47b275a3510
font_02_sfnt_off0001ae67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE67 12532 bytes
SHA-256: cf826e140aef422d51b32ea7b420f497d1fd7f6f3c21ca752f389990907d5146