Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd357e8b2e7956f4…

MALICIOUS

PDF

74.9 KB Created: 2021-03-19 22:07:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2a2cc09c20f30891d5d91830422fcd62 SHA-1: 76f96f319ca34d18097dcd49673ef6edac26c1c4 SHA-256: fd357e8b2e7956f4b49c8461f8a998da55ea8224ca4eb296dff6664672798d9f
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary one pointing to 'soxebez.ru', likely serving as a lure to a malicious site. The document's structure and embedded links suggest it's designed to trick users into visiting external, potentially harmful, web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://soxebez.ru/award?keyword=angle+bar+weight+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449769/normal_5ff8c6fed6485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387033/normal_603b41dd9c337.pdfIn PDF document text
    • http://bitcoinov.site/how_to_crochet_newborn_baby_cardiganzfjd2.pdfIn PDF document text
    • http://haustova.com/keronivovemenimejetn53q.pdfIn PDF document text
    • http://circleshtang.xyz/benebajansvpkd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480142/normal_5fdd59f3c94cf.pdfIn PDF document text
    • http://hangookoil.ru/milkweed_book_summary_chapter_20a6szs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_604ce048c2612.pdfIn PDF document text
    • http://dompodklyuch.com/what_is_12_48_in_its_simplest_form0co4i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490528/normal_60511a7aea9cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417525/normal_604f9be6a9185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369774/normal_5fcf9e4d55530.pdfIn PDF document text
    • http://harmony-market.ru/bohemian_rhapsody_free_online_redditb6o3c.pdfIn PDF document text
    • http://triple-doska5.club/51830012879nbmvw.pdfIn PDF document text
    • http://eduha.online/vpn_gate_openvpn_androidhwj6d.pdfIn PDF document text
    • http://bonboxstudio.com/how_to_earn_extra_money_during_coviddekrs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/piridobelivako.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/amrutanubhav_granth.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/aptitude_test_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/xijesazo.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/19159047098.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_off0000e84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 5348 bytes
SHA-256: 657b7d8d9f96c94abfdf47cdc4649da8c473a457fe14be649f78c3bb837588e1
font_01_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 10616 bytes
SHA-256: 41a8b25145c7f77e0585b55b87ea65108a8e2f83963a90e065fcc4fec645c461

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