Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4b046ea2ade69f…

MALICIOUS

PDF

78.1 KB Created: 2021-03-20 07:10:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f62c6b9460c55b6f9717145656bb812b SHA-1: 5339746733087c3f62fb133a316f77ee30208349 SHA-256: ff4b046ea2ade69f67271e58ca6a282a77dfed04d2a245244929a743307e4ff7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/123?utm_term=ocean+basket+sushi+menu+south+africa+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fcfed531836f.pdfIn PDF document text
    • https://cdn.sqhk.co/pexevoxe/bihy7Ps/64034896868.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/ihfggHT/jesowinaruborizowip.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/RjiylGR/ahly_vs_zamalek_today.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417423/normal_6038b66d9f7a1.pdfIn PDF document text
    • https://cdn.sqhk.co/zatanolivog/giQ7JLg/village_hall_fire_risk_assessment_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447912/normal_6049245fb5452.pdfIn PDF document text
    • https://cdn.sqhk.co/dowamagova/ijCjdjb/20748686313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458631/normal_6030e9c9b0f00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469136/normal_5fcc3bbc37680.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/ziedOgN/late_90s_early_2000s_rock_hits_playlist.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/gge6dgg/parujagori.pdfIn PDF document text
    • https://cdn.sqhk.co/kozosorole/GieRVja/gardenscapes_level_2554.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/2d03d45d-a51b-4fcb-b4ea-e0a13a1bb964/52832904441.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/imperial_march_piano_duet_sheet_music.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_718c6e4126484bb0b20c88f601a96bbb.pdf?index=trueIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_ccef5cbc4ef3484eac70f324640dd210.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisazabe/20181314524.pdfIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_f4874caaa50c47678774c7b90a9c2a19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89a53a91-5152-4d49-8de6-17f4319a4cd1/28311446039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f0c599-4000-4ad9-90e6-cb53bc478f58/das_feriados_en_puerto_rico_2020_gobierno.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/tv_guide_hobart_tuesday.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/72789540365.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/extrusion_acrylic_sheet.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_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 5592 bytes
SHA-256: c12ef9abb1d04926ffe8b25603d2c640308500535dd1273696b57dd4a1e8654b
font_01_sfnt_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 10996 bytes
SHA-256: acfed6206525f29b48e2be74b8daf0556b13b5f7f042376f4ca99338886211a0