Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b571cafdc9d4d4…

MALICIOUS

PDF

67.7 KB Created: 2021-02-24 22:48:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9aa0ea1156b8ec72377691921f722387 SHA-1: 7611bef636daf7da53b6a1f6e01baf517ae417a6 SHA-256: d9b571cafdc9d4d4630703b33dfca901f3b85fa574d8f81d654d664f96443bb5
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO spam campaign. It contains a large number of external links, with one pointing to a URL that appears to be part of a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest potential malicious activity, possibly involving JavaScript for exploitation or redirection.

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 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://seumenha.ru/wix?keyword=trek+bike+lock+manual PDF link annotation
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/goxomipagoget-durozolarosow.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/city_of_bones_cassandra_clare_shadowhunters.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/axiom_pro_49_power_supply.pdfIn PDF document text
    • https://jadilibetaz.weebly.com/uploads/1/3/4/8/134871175/buvojosife.pdfIn PDF document text
    • http://zogaranana.22web.org/cost_accounting_income_statement_format.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/gefumuvafosodirovebalasa.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/baxegezivumi/81068018508.pdfIn PDF document text
    • http://luwawabegopit.rf.gd/josuxomez.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/70318622750.pdfIn PDF document text
    • http://merojupamen.epizy.com/game_battleground_offline_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/92964641485.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/28594362218.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/why_does_my_apple_music_keep_disappearing.pdfIn PDF document text
    • http://rekolesiri.rf.gd/kolkata_tourism_guide.pdfIn PDF document text
    • http://wapuzega.rf.gd/58344917849.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_off0000ce6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6E 4920 bytes
SHA-256: 1cc83ac6eadcdf6f4d3e2a25d46aa194dcd9c3eaf836bac5a094adb5cf74519a
font_01_sfnt_off0000df14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF14 10284 bytes
SHA-256: 178919659d1a7ffa79844917b2e5ad50d2f8a6f56039e05a21efd0476a399510

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