Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39e03e090671244…

MALICIOUS

PDF

74.6 KB Created: 2021-03-08 08:05:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2111aeabea31dbd0421fb565b3aa8cad SHA-1: da68c99e468bbf48407971be80d3d0eae7d7025f SHA-256: a39e03e0906712440e7763a1c1a773537dbf666102ce83fa2ffe046a20fc39a6
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, with the primary URL pointing to a site likely involved in phishing or SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://lozipotod.ru/strik?utm_term=how+to+get+cobra+walkie+talkies+to+work PDF link annotation
    • https://cdn.sqhk.co/bozogekeji/ghfFakR/39076226300.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/VidkgdY/rifodurujivesidamivovofi.pdfIn PDF document text
    • http://hushseo.online/aladdin_jr_directors_scriptsbkg3.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/eyPpjcx/tisipapeduwepib.pdfIn PDF document text
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/3240188a461ba43.pdfIn PDF document text
    • http://kitazixozakabu.sportsontheweb.net/james_and_the_giant_peach_jr_script_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kusedesomawa/aX4Q5i0/larinapifopo.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/will_attorney_near_me_free_consultation.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/98453267736.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/mammary_tumor_in_dog_burstmd53c.pdfIn PDF document text
    • http://bonboxstudio.com/kuwidepofirerugslqvl.pdfIn PDF document text
    • https://cdn.sqhk.co/zalenemu/hjiijgf/saronuvitilijonon.pdfIn PDF document text
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/9353738.pdfIn PDF document text
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/955419.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/satuma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sodowurivav.onlinewebshop.net/ge_true_temp_range_oven_handle.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/inferno_dante_summary.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_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 5224 bytes
SHA-256: 24fccb025902adc3b53eee1969df426b9104212d4c1d8265da92c21e02513f3e
font_01_sfnt_off0000f8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 10796 bytes
SHA-256: d38cc3220863119256b54cdc7af589fa0981b083987a28016638c6f189ddced1

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