Malicious PDF — malware analysis report

Static analysis result for SHA-256 720115b593a897d7…

MALICIOUS

PDF

78.5 KB Created: 2021-02-24 23:13:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: acf21735946197bd9a3c35b937d6d727 SHA-1: 721c1f92652325f066a4f59899dfc928b6b19981 SHA-256: 720115b593a897d72811e7ec950349798723d601ef83f2a5b3d686a1f5e46fea
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though truncated, suggests a lure related to sales listings. The presence of numerous external URIs, including one pointing to 'baarspo.ru', strongly suggests the document is designed to redirect users to potentially malicious websites for phishing or malware distribution. No scripts were extracted, but the PDF structure itself contains malicious elements.

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://baarspo.ru/award?keyword=second+hand+collectors+dolls+houses+for+sale PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417999/normal_5fc732f5c93a4.pdfIn PDF document text
    • http://ultra0.space/377799177910xtbi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_600d440be641d.pdfIn PDF document text
    • http://azorocheat6.xyz/99917211989xmmm9.pdfIn PDF document text
    • http://bahis-sikayet.com/windows_10_cis_hardening_guidegnroo.pdfIn PDF document text
    • http://arevakar-travel.com/31550917356rb8kk.pdfIn PDF document text
    • http://babysampler.com/parasitologia_de_botero_5ta_edicion_gratis68m6g.pdfIn PDF document text
    • http://glossywp.online/radisilutevawodogofom1q46r.pdfIn PDF document text
    • http://zarabatyivat.ru/306119941629stb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419191/normal_5ff9f9aa7b870.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vilujemes.rf.gd/rexutisir.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/exercise_g5-_1_sentence_fragments_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_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 5212 bytes
SHA-256: ee114d2030d1cb18c5b88f338c640b025a26b01b9b0342dfe2513f98ad2a4b62
font_01_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 10440 bytes
SHA-256: 5dd6ae9b4b3b4db8278192fcaa7947edde5dbfeaffa472c724dafbd78010fa76

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