Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98b36e84d8d31dc…

MALICIOUS

PDF

65.2 KB Created: 2021-02-13 08:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9f6b7a958cc4622aa828c2fda02017ef SHA-1: b0964d56523b608e82444f85f48601c0384766b6 SHA-256: a98b36e84d8d31dcdf20621f0ea927401db54c6a51bec8e998279226ea7201e7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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 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://maypoin.ru/123?utm_term=witchery+golden+chalk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379610/normal_602655d76c679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5fd75fe88cf93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460686/normal_6015576da2bbd.pdfIn PDF document text
    • http://myfirstsite.xyz/schaums_3000_solved_problems_in_phy26feh.pdfIn PDF document text
    • http://rrrrkkkkk.space/77378638185je62x.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/ifo6c63/galactic_civilizations_iii_crusade_expansion_pack.pdfIn PDF document text
    • http://antileqphh.site/9578419745tm2pg.pdfIn PDF document text
    • http://masito.space/bojaxilojobdczdr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472198/normal_6008df97e243c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_6023d27b622c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476302/normal_5fe34107cf148.pdfIn PDF document text
    • http://fartook.online/world_war_3_countdown_gameswbvm.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/i9ifiif/non_travel_bucket_list_ideas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466675/normal_600a90efef43b.pdfIn PDF document text
    • http://zoomita.fun/snake_plant_benefits_in_tamilguq3m.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/81051840837e0di4.pdfIn PDF document text
    • http://wownatural.fun/tidiputepobikavitoycq3p.pdfIn PDF document text
    • http://fitokaps.xyz/crash_team_racing_nitro_fueled_pc_download_full12gvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491723/normal_5fff3102a4a97.pdfIn PDF document text
    • https://jowavuzawevubab.weebly.com/uploads/1/3/2/3/132303017/d768ed3fecb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC215 5200 bytes
SHA-256: 02387a864422ea34bfa803c77ae4ccc451a66d5b004decd90535e47acfe269e6
font_01_sfnt_off0000d3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 10552 bytes
SHA-256: ec4a0c2e89d85ee6d2e9a5fb8bfe36503b0cb68d9bb963fbc9b3e27b45e28625

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