Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b16591750c58976…

MALICIOUS

PDF

80.9 KB Created: 2021-05-18 19:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06bb8a6292706580ecbd44d767b394a8 SHA-1: b4c7a2bc80b9ff095b5c83bdc6c30bfbcba0a832 SHA-256: 3b16591750c58976f4678b1a93ee9f3454046bc8979fd1c92c3b28d26ddef570
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing. One prominent URL, 'https://seumenha.ru/strik?utm_term=what+does+a+low+amylase+and+lipase+level+mean', appears to be a lure to a malicious site. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting an attempt to manipulate search engine results or direct users to malicious content. Although no scripts were explicitly extracted, the nature of the links and the ML classification strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=what+does+a+low+amylase+and+lipase+level+mean
    • https://cdn-cms.f-static.net/uploads/4486963/normal_601e3aec98af4.pdf
    • https://cdn-cms.f-static.net/uploads/4454995/normal_602b34e1d17f4.pdf
    • https://wowobomufib.weebly.com/uploads/1/3/0/8/130874304/kivorawof_xenesurikimuto_petupujiniva.pdf
    • https://rotolakudezi.weebly.com/uploads/1/3/4/0/134041133/7231795.pdf
    • https://static.s123-cdn-static.com/uploads/4417429/normal_5fe10094d9399.pdf
    • https://wariraxaluxar.weebly.com/uploads/1/3/3/9/133986847/fotetefowifepul-duveminura-kelemunexag-rexunixe.pdf
    • https://cdn-cms.f-static.net/uploads/4456984/normal_6016df3399fed.pdf
    • https://xurigatunirefor.weebly.com/uploads/1/3/4/6/134635133/jisezikano_zubin_livoxesotu.pdf
    • https://dutofubexel.weebly.com/uploads/1/3/4/6/134631161/nutowazowimoweru.pdf
    • https://static.s123-cdn-static.com/uploads/4472216/normal_60013b6fb5ba5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tixinova.rf.gd/can_you_turn_on_bose_soundbar_without_remote.pdf
    • https://s3.amazonaws.com/petikamov/company_identification_card_template.pdf
    • https://s3.amazonaws.com/patilawasu/management_accounting_system.pdf
    • https://s3.amazonaws.com/fazujo/why_the_rich_are_getting_richer_robert_t._kiyosaki.pdf
    • https://uploads.strikinglycdn.com/files/4798e0ee-fc02-4e44-8046-e003e6d3b605/74356385632.pdf
    • https://uploads.strikinglycdn.com/files/9ee21732-5182-488a-8fff-0888090fcd4f/26804456351.pdf
    • https://s3.amazonaws.com/bomifabipi/98585839697.pdf
    • https://s3.amazonaws.com/vesubodufisi/how_to_reset_nordic_treadmill.pdf
    • http://jijetebum.epizy.com/spice_and_wolf_manga_ending.pdf
    • https://uploads.strikinglycdn.com/files/9f01c215-5fe9-4956-b1ea-7a3b679f099d/msica_techno_mix_de_los_80_y_90.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a2.bin
bdf8c7f86815fffb1081ed4319b4cfb303371ce7cd6c67ff30ef3ae0a2c76a93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 5160 bytes
font_01_sfnt_off0001042a.bin
561c11472100e8f871ccc4461f06b99800808cc89ec98bd1fad74fa46f154b1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 10636 bytes
font_02_sfnt_off00012849.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12849 4324 bytes

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