Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd79ff8cc30b9949…

MALICIOUS

PDF

71.5 KB Created: 2021-04-26 06:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3c16e13d460fdde38892f51fe200ed9a SHA-1: 056cf9e631ed5b6fdce22235e185f6845b1326eb SHA-256: cd79ff8cc30b9949dcbfc39d237744ae177fccb24c2f24745e76fe65414b7421
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious content.

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://maypoin.ru/strik?utm_term=how+to+use+logitech+r800+laser+presentation+remote PDF link annotation
    • https://cdn.sqhk.co/gugapedulob/Oyjc2hf/pogiwago.pdfIn PDF document text
    • http://justamorem.com/tozafas3n3t.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/jPgeigd/guxisenavozewom.pdfIn PDF document text
    • https://ponebivilu.weebly.com/uploads/1/3/4/5/134505494/gakejuvevifuli_rasapoviduvi_mebexed_tonanere.pdfIn PDF document text
    • https://laredewidoz.weebly.com/uploads/1/3/5/3/135301194/ab7ec.pdfIn PDF document text
    • https://cdn.sqhk.co/risejesob/snggjgD/1st_grade_math_worksheets_teks.pdfIn PDF document text
    • https://cdn.sqhk.co/doburazax/euYlia8/85604465117.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/hapidie/meter_reading_easy_definition.pdfIn PDF document text
    • http://itdiscounts.pro/1938232049303lf7.pdfIn PDF document text
    • https://nefikeroliv.weebly.com/uploads/1/3/1/4/131453179/wawemugopuvot.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/eMNhiYr/live_voice_changer_free_no_download.pdfIn PDF document text
    • http://businesshelpservice.com/67864455846gb2q5.pdfIn PDF document text
    • http://uspex22.online/shimano_di2_ultegra_vs_dura_acegbys1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_92488e1ec3034dc18e2edbf70ce3e074.pdf?index=trueIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_dbe63679844443fe9ae8e919f3ca10ce.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_0216bebabc4245548a9324a65f204f55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2fdf51f-cfe9-4fe1-8863-c82b33a9f134/possessive_form_of_nouns_worksheet_for_grade_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf789b6-2050-404e-a87a-e532aa9a371a/pemowomexaxigofama.pdfIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_f064f62898a145ef81b6d79dd44d4a32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c374cb87-fde8-49c9-a1d1-8c2a5f68c986/falcon_bms_manual_4.34.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/786631ff-d298-4d29-be4f-f6e401856d67/raledo.pdfIn PDF document text
    • https://c4647614-9ff8-4b00-b819-08dc938bd166.filesusr.com/ugd/5d3f24_bbe7ac9899994c20a959cd86ec98ad58.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_off0000d794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 5736 bytes
SHA-256: f58f3fdc32b5cf772984f0c5115f29eddc521f12177e013b21f5e6f4321dc89a
font_01_sfnt_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 10912 bytes
SHA-256: 355243cea3d39644b1bf2865a6adbb101597a7886e4173b24513154b7b365cdd