Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa901f077b5a2e2…

MALICIOUS

PDF

74.1 KB Created: 2021-03-09 21:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c97c79dfd9afe9ec29df89d8e37df4e0 SHA-1: 9074fbd76aeef6389d677d2089a44614904be26d SHA-256: 4fa901f077b5a2e2b5b40bb3d094150301a845ff3801d70f61d2855dfc3cd8a9
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 0.9997

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://zajinet.ru/award?keyword=job+vacancy+advertisement+sample+pdf PDF link annotation
    • https://xolufoxe.weebly.com/uploads/1/3/4/5/134501271/fegujazuneluso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479675/normal_5fcedbc853a49.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/hfXMhcR/vukonenud.pdfIn PDF document text
    • http://sokfresh.fun/video_editor_free_20194ou1r.pdfIn PDF document text
    • https://cdn.sqhk.co/jipodipotaj/TjjH4id/8279772225.pdfIn PDF document text
    • https://kirugivedipabaw.weebly.com/uploads/1/3/4/4/134464293/6176659.pdfIn PDF document text
    • http://btsworld.org/glitch_text_premiere_pro_presets_freeemx7j.pdfIn PDF document text
    • https://balixilime.weebly.com/uploads/1/3/1/3/131398392/fedomajozisaf.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/27db60cf2.pdfIn PDF document text
    • https://cdn.sqhk.co/luveruzosu/Jbiglie/livibojesebos.pdfIn PDF document text
    • https://lobobofu.weebly.com/uploads/1/3/4/6/134680821/wumofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_6046d8859068d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e53d7514-a496-4569-a6f8-039965b0b118/frederic_delavier_strength_training_anatomy_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c1dade7-0e93-4e4b-94a3-679d4e0c1ee3/81994122990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e089f5f-fdd9-484f-b042-be8cdf94dabc/topegopuzozebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c776d010-43ff-448c-9933-c5dacb2e8359/raninal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c8916cf-5f49-4423-abbf-ce3cf9436be7/gunamupoter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da2572c6-0ced-4015-8a96-d8b2da179a45/gunvault_minivault_gv1000s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de834714-e8fa-4c58-9bd6-c393a62de6dd/rujoradamiwikupowapupibom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5857d3da-b3c7-41e6-bc12-99a50e8fc05d/mitrokhin_archive_in_hindi.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_off0000e5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 5592 bytes
SHA-256: 3fc9937d08696839486c0d1b4125aeca5e4cc30407555374d781e7e878275894
font_01_sfnt_off0000f8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 10048 bytes
SHA-256: 037ae7279969f82f11cee1cc0a20ccbf2972391c62dfd09a8d7f6cbccdea17ec

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