Malicious PDF — malware analysis report

Static analysis result for SHA-256 4488af67b4143411…

MALICIOUS

PDF

84.0 KB Created: 2021-02-23 22:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 17825c5e9f3d047859f6514f47d4174f SHA-1: 8da327681cacefa1e0b1db5d2d78781efb7aad20 SHA-256: 4488af67b4143411661012872837885323d52febe85fa6b0911f443520ca716b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to contain a lure related to Samsung TV remote issues, directing users to the malicious URL https://seumenha.ru/strik. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

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 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.
  • 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://seumenha.ru/strik?utm_term=why+is+my+samsung+tv+remote+blinking+red PDF link annotation
    • https://cdn.sqhk.co/noxomosanena/dSgjigF/jogumedagafalolagejewanad.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/Rijbi2Q/pixel_starships_build_guide.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/fezoderuromaz.pdfIn PDF document text
    • http://wukebejajixajen.iblogger.org/rorira.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452400/normal_5fff285f1f46a.pdfIn PDF document text
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/651fd0b.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/hbo7Wjj/race_film_tom_cruise_dustin_hoffman.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luzafofefo.rf.gd/sylvia_plath_ariel_collection_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/90638684439.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/89579828063.pdfIn PDF document text
    • http://ragekelovu.rf.gd/50084675224.pdfIn PDF document text
    • http://leribilif.rf.gd/87408775164.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/kodidunozavejupepafuloxav.pdfIn PDF document text
    • http://demiwadipojaz.epizy.com/wonavezenafi.pdfIn PDF document text
    • http://luwegovufa.epizy.com/aankhen_full_movie_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/chiari_one_malformation_with_syrinx.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/derupajojikagopopamu.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_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 5620 bytes
SHA-256: e9c02345b86190e4f051ba533a32e76b7309fcdf4effe3f4799eb6a51ff0be21
font_01_sfnt_off00011dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD0 10764 bytes
SHA-256: e9b81e17381dd34606c1575b0a5d2d894a0965fb4fbede6e1596d497ff8badc4

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