Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b47836cbdb158e6…

MALICIOUS

PDF

72.5 KB Created: 2021-03-02 12:12:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 45b9771f3176ad60990a51c5617b97b1 SHA-1: 785570cc67a3aac27e72c73ba40fec703446046d SHA-256: 1b47836cbdb158e64cb2151af0630136522b83ba5981a1b15776bf7e7cf70192
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic confirm the redirection attempt to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=irobot+braava+jet+m6+robot+mop+price PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471514/normal_6005290ad53ce.pdfIn PDF document text
    • http://leomannapov.com/13300864430skthh.pdfIn PDF document text
    • http://woxemezamuj.iblogger.org/what_the_holy_bible_says_about_tattoos.pdfIn PDF document text
    • http://safetymirrors.xyz/examples_of_newspaper_report_writingtkb4t.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/19140076381rtuuo.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/learn_english_speaking_for_beginners_youtube.pdfIn PDF document text
    • http://kawasus.scienceontheweb.net/35485505056.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/19632016635.pdfIn PDF document text
    • http://converstarget.ru/song_lyrics_video_maker_apkcrqbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372080/normal_6016c9b870939.pdfIn PDF document text
    • http://operationhomeplate.com/3180635148k8hoh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sabuxixu.epizy.com/chiari_malformation_types_ppt.pdfIn PDF document text
    • http://surofavuvaxono.epizy.com/jovewewidaj.pdfIn PDF document text
    • http://supajiwa.myartsonline.com/48921506996.pdfIn PDF document text
    • http://jewezoku.epizy.com/rulupusuxivumarijut.pdfIn PDF document text
    • http://kuzebelinebofe.epizy.com/58035894826.pdfIn PDF document text
    • http://kugefosames.rf.gd/joxititesinepepixebod.pdfIn PDF document text
    • http://febarufowit.epizy.com/auto_transformer_starter_control_diagram.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_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 5236 bytes
SHA-256: 4ac59641b2a01c9b93e0f6172c91c07045bf9257130a4c7d6c4a067cd95ec33a
font_01_sfnt_off0000f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 10392 bytes
SHA-256: a451a3e22447c1d3ed5236a3ad2ce07229f821322d0dc493e66d11c3c94ebad9

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