Malicious PDF — malware analysis report

Static analysis result for SHA-256 6004e81ecee4af95…

MALICIOUS

PDF

78.2 KB Created: 2021-03-24 08:14:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 02da68c216b6adbf347da5c8680ec8a6 SHA-1: 4f056c94f2e970e52f3d33f27f342f9b06464f3c SHA-256: 6004e81ecee4af954ec9c36059e9c64dfaed4917cebbfb65ad2b69361c265567
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are likely part of a link farm, and one specific URL points to a suspicious domain. The document body, though heavily obfuscated, suggests a medical topic, likely a lure. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common vector for malicious PDFs to exploit vulnerabilities or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://jacksth.ru/award?keyword=drenaje+absceso+cutaneo+pdf PDF link annotation
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/8506799.pdfIn PDF document text
    • https://vojonabof.weebly.com/uploads/1/3/1/3/131383251/7d3ec5f9f0055d.pdfIn PDF document text
    • http://xovijezup.mywebcommunity.org/ketiregadid.pdfIn PDF document text
    • https://biwamuneluzotip.weebly.com/uploads/1/3/2/6/132696598/acf355c42e7f4d.pdfIn PDF document text
    • https://dabesego.weebly.com/uploads/1/3/2/7/132740865/3261213.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/bakedijedigaseroliwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450347/normal_5fdd94cb69c47.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/what_trees_grow_well_in_central_florida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_600d32bf72be4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_6026ca3cc92be.pdfIn PDF document text
    • https://sekitajed.weebly.com/uploads/1/3/1/3/131383533/9f81794b1.pdfIn PDF document text
    • https://melitefikexaj.weebly.com/uploads/1/3/4/3/134315726/lufuraf-remenur-figoxe.pdfIn PDF document text
    • https://tiluzapibijodok.weebly.com/uploads/1/3/4/2/134265907/zunat.pdfIn PDF document text
    • https://luzenage.weebly.com/uploads/1/3/4/3/134317967/ecf79fde1edc8fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kimone/hp_4630_not_turning_on.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/life_expectancy_homeless_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/mezokajuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/addition_fact_worksheets_to_20.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/nutoxeregiteri.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/magazine_cover_design_psd_file_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/blank_page_file.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/29128534621.pdfIn PDF document text
    • http://sokekakeloji.onlinewebshop.net/22483981716.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_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 5332 bytes
SHA-256: 641bf8f5229f5518e1f2f0c16df0b96e23a752a5299e832c409867e74dc37945
font_01_sfnt_off00010415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 11664 bytes
SHA-256: be1ee5c1c5bd2d58cd1e1ee2add80f0727b25ec6b0a231fdb57a16bdd5abae3b

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