Malicious PDF — malware analysis report

Static analysis result for SHA-256 f458a91bf1719303…

MALICIOUS

PDF

81.0 KB Created: 2021-04-23 13:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8ba99997c29d3b163d5508563b30eaa6 SHA-1: da973fe427093a00a03844f795c9c9c272f437cf SHA-256: f458a91bf1719303ab6955662040962c0d100301e96032a4f7b60aef0f8f0f14
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 attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the structure of the PDF point towards an attempt to redirect users to malicious sites.

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://golowaki.ru/strik?utm_term=ipad+mini+5th+generation+case+amazon PDF link annotation
    • https://tikedamo.weebly.com/uploads/1/3/1/4/131453682/c5b26c1.pdfIn PDF document text
    • https://zerimesatevig.weebly.com/uploads/1/3/4/8/134879836/67cd8ad8.pdfIn PDF document text
    • https://dokerawu.weebly.com/uploads/1/3/4/3/134313580/88cda4282e7c086.pdfIn PDF document text
    • https://mizunemaki.weebly.com/uploads/1/3/4/8/134850414/0d86f5.pdfIn PDF document text
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/kovaxog_wofiwasemixu_vogovoxasog.pdfIn PDF document text
    • https://zisafidavilux.weebly.com/uploads/1/3/2/8/132814196/b09bca18a76030d.pdfIn PDF document text
    • https://lokevevivepino.weebly.com/uploads/1/3/4/1/134131736/nixizawu_dirof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_34a54a6e4e934488874772e55fec7374.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90868ed2-5d37-45fb-bdb5-2bf0a89ec8bc/how_to_use_the_keurig_k_duo_plus.pdfIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_a44c2c5617c6432aa652fafc29b89acb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/428072ee-4034-4e9f-9cb1-7442edcfe4a5/easy_piano_christmas_songs_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0b33172-6ed8-4e94-9059-c82e8339ad98/20936665580.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/parenteral_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/arbitration_act_1996_india.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_67fe1aa8706f4ccfb2cb2c06d9152b4a.pdf?index=trueIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_f1d03924d4494dee868b54074dac2cb0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac4f6680-b923-4c40-a281-1df7f5823a03/scary_stories_to_tell_in_the_dark_cast_members.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/24284414364.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/price_action_bible_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/3._3_cell_organelles_study_guide_answers.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_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 5564 bytes
SHA-256: b684f6a2e25cacd3d3fc5a0dfeb9fe6c5c3ba14736ab682499a418f3b5c0ea13
font_01_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 11544 bytes
SHA-256: 64048dccc3fd5d331b9084d26880798107f944b4e86a3310bf9f4284c1ea3d36