Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7676e387d9c5a3…

MALICIOUS

PDF

76.0 KB Created: 2021-04-01 09:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a25de79aed414cf48ecf87ab3a812e56 SHA-1: 5f29758542168ff16451043524c5cc3ed35edd9a SHA-256: cf7676e387d9c5a3a3d728ba000575b8b7b0764b7f679b14445bc60c7d5b0abc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 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://jottigo.ru/strik?utm_term=starting+strength+program+over+40 PDF link annotation
    • https://rakevuxex.weebly.com/uploads/1/3/4/0/134040666/jevidiz-tozezale.pdfIn PDF document text
    • http://vovpomnim.ru/sodastream_fizzi_tips_and_tricksa0kn9.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/hcjgEih/lezorevakomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423430/normal_5fd1e04121526.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/Bmbhctb/fallout_3_game_of_the_year_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477886/normal_5feda817b896e.pdfIn PDF document text
    • http://nutristrike-shop.ru/442890010031ub0n.pdfIn PDF document text
    • https://cdn.sqhk.co/moturira/hfhciiD/dictionary_python_get_all_values.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/yjjWgij/kigikidod.pdfIn PDF document text
    • https://zirilomeme.weebly.com/uploads/1/3/6/0/136025267/5afc95986499b6.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/jPnogcC/fafimiputelenusisera.pdfIn PDF document text
    • http://igbusinessabouthelp.com/2987629473xwww7.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdfIn PDF document text
    • https://pemimitajeli.weebly.com/uploads/1/3/0/7/130739011/1455461.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/igtVYOL/wewoju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b53f16eb-4608-42de-acae-a608c3f8ed16/wojurul.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 5384 bytes
SHA-256: 82202a6b1dc1dc9b9d27eaec0f326b6bd6497c880941acadec0b224f0f0b7000
font_01_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 10612 bytes
SHA-256: 357c60f6053eb46e73d647f481957b39a229cc17513f840b3f72be23531afb6b
font_02_sfnt_off00011705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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