Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad910cfd82eefb0b…

MALICIOUS

PDF

83.4 KB Created: 2020-12-26 21:35:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: bb3a1139ea19218071ab2608cfe418af SHA-1: 13f39d46f700a167b135296f180a12519de872a4 SHA-256: ad910cfd82eefb0b7f32ae86bd701e154c42954c623c9841c478ccde2deb9a3f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, but the primary attack pattern involves directing users to external resources.

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://trafftec.ru/strik?utm_term=ivan+the+terrible+movie+2009 PDF link annotation
    • https://xexalidifiso.weebly.com/uploads/1/3/4/6/134685587/8512613.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/bZjajg4/zero_gravity_skydive_drop_zone.pdfIn PDF document text
    • https://jokuduzasaru.weebly.com/uploads/1/3/1/3/131381103/galepugazefita.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/LDlEUhf/vonijijibivawajanubenuj.pdfIn PDF document text
    • https://cdn.sqhk.co/kevejonob/gigdMih/swamp_thing_comic.pdfIn PDF document text
    • https://gejodaxavusaw.weebly.com/uploads/1/3/4/7/134708791/mopeboremeb-kiruruvez.pdfIn PDF document text
    • https://cdn.sqhk.co/jegisizozul/djdggDE/prison_planet_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/retuwami/33hbjd3/35477719898.pdfIn PDF document text
    • https://rigivopamakor.weebly.com/uploads/1/3/4/8/134869382/kazusuwukenatib.pdfIn PDF document text
    • https://kipunokazapalu.weebly.com/uploads/1/3/4/7/134774983/4605231.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/gitesedow.pdfIn PDF document text
    • https://pozimetotekiv.weebly.com/uploads/1/3/4/3/134339641/817128565.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwibagula/Dhgifif/ax_3_domaines_neige.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/63e2f726-a18d-4b1a-ac9d-5f2a2d6133c7/the_russian_revolution_guided_readin.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 5316 bytes
SHA-256: 9bdbc7096fc1b9667ce463de99723930a1506b371c0e1421eedfdb282f7573ec
font_01_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 13644 bytes
SHA-256: bac08a5c1a24683c6a7ca163a524020d6e61a67ece1e368941a63b8fec56f9e6
font_02_sfnt_off00012c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1A 16060 bytes
SHA-256: 1018660efa6a1a00280f0dbd6ee9814149b2344b9acf14d98de2cb76d1e712aa

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