Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbecabc84ccc863b…

MALICIOUS

PDF

73.4 KB Created: 2021-03-21 09:35:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7a53d73967c9255b8262b265933e6dd1 SHA-1: 2892797892c9490d274deb5ef70a25dc4806d23a SHA-256: fbecabc84ccc863bcefa6bdb798d2901ab40221516dcef1cf9d60136cf70ddb8
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=what+are+the+ten+deadly+sins PDF link annotation
    • http://vuvowepo.22web.org/birthday_greeting_cards_image_free.pdfIn PDF document text
    • https://gifofelonapa.weebly.com/uploads/1/3/0/7/130775883/ed986d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_602d343bda357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504788/normal_600c8bec5fd0f.pdfIn PDF document text
    • https://fezagigix.weebly.com/uploads/1/3/0/8/130813643/dobolo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455195/normal_5feb497a01014.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/jPlnPhW/digi_telecommunications_head_office_number_pennsylvania.pdfIn PDF document text
    • http://zipogagu.iblogger.org/practical_capillary_electrophoresis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceb5a818-14cb-4ef1-b03f-f3b03d8df961/apc_smart-ups_1500va_lcd_230v_with_smartconnect_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed05f49-b1ec-492a-8de0-ac6676e9e240/73339754358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468799f5-b4cd-4cfa-b62e-e958d1e58fb9/kiditoxifaw.pdfIn PDF document text
    • http://lenomona.rf.gd/xabesemak.pdfIn PDF document text
    • http://nanamiw.epizy.com/64697621052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce180deb-8aa8-493d-b794-ea9ac90c9338/arduino_uno_r3_cheap_price.pdfIn PDF document text
    • http://roragopijejem.epizy.com/nintendo_ds_pink_price.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_off0000e163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 5028 bytes
SHA-256: 38dc7912190825b2710cd1e7fda02d0aa644f44893c4c8b807d7e508ddbf2f5b
font_01_sfnt_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 11336 bytes
SHA-256: d28d4327c06082cb08683b81d841dd1677687d6ea6f6374196207d19e46b75d1

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