Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4c4a636f8039fc…

MALICIOUS

PDF

76.8 KB Created: 2021-05-09 21:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 52fca897dca66bd5142df1236e1a9766 SHA-1: 3059b36386280830e47128816c821f27be63f7ad SHA-256: bf4c4a636f8039fc02b08bd3bf134b6f4e08ae8e81247413eb5fd9d8dd2a9840
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with one pointing to 'pelibifir.ru', which is flagged as suspicious. The 'PDF_SEO_LINK_FARM' heuristic indicates a mass of external PDF links, suggesting a coordinated effort to distribute malicious content or engage in phishing. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score point towards a malicious intent, likely related to phishing or malware distribution.

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://pelibifir.ru/strik?utm_term=james+allen+smith+bastrop+tx PDF link annotation
    • https://kasababafaraw.weebly.com/uploads/1/3/5/3/135336348/1da163d2a4e1bc.pdfIn PDF document text
    • https://wezunemoxojo.weebly.com/uploads/1/3/5/3/135321606/nuwovibelizimub.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/does_walmart_sell_gluten_free_food.pdfIn PDF document text
    • http://girlita.space/nulutifutomuvuzekitemn83p4.pdfIn PDF document text
    • http://bahis-sikayet.com/anonymous_police_report_san_diegog6ny8.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/18770511802.pdfIn PDF document text
    • http://tapavinologo.mygamesonline.org/nationwide_ceasefire_agreement.pdfIn PDF document text
    • https://dogeneli.weebly.com/uploads/1/3/0/7/130776728/dadimidopujaw.pdfIn PDF document text
    • http://wivevemeb.scienceontheweb.net/seguridad_jurdica_unam.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/lefemijip/49329666490.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/21168816847.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/zamigoxezib.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/the_crown_season_3_episode_7_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/dd_druid_spells_3.5.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/baba_song_whatsapp_status_video.pdfIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_3e3d717cc4894bc79a4362b0c35581b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wemazun/7637257169.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/93295237089.pdfIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_09201ea9e0324f339962294c49e38d70.pdf?index=trueIn 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_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 5256 bytes
SHA-256: 1abd1b035aacf14057a76b1b4a2eb144985506ab888cec4ec93d1d92799d1bb5
font_01_sfnt_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 11584 bytes
SHA-256: d5709645fb72defe800996277d4bdc3ed12570a23a8f4bcc89ab94494512dceb

Open this report in the interactive analyzer, or submit your own file for analysis.