Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30323fb849413f7…

MALICIOUS

PDF

71.7 KB Created: 2021-02-27 12:01:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 00c0ce89908adfaec147d5e00b5feb7b SHA-1: 325f4ddd25d7b7a01ee821bea176625ecc2054eb SHA-256: c30323fb849413f75b3a53f9882dfb50af854d773098969644f1e530c9cf15e2
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf', suggesting it was generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jottigo.ru/award?keyword=briggs+and+stratton+725+series+oil PDF link annotation
    • http://jofifuneku.medianewsonline.com/10979432001.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/cambiar_tipo_de_archivo_de_audio.pdfIn PDF document text
    • https://lunisaga.weebly.com/uploads/1/3/5/3/135302545/gipometiwulepug.pdfIn PDF document text
    • http://edarudost.online/101466119020tsdc.pdfIn PDF document text
    • http://zdorovienashevse.xyz/cute_bear_backgroundswx21c.pdfIn PDF document text
    • https://gunagejosiva.weebly.com/uploads/1/3/0/7/130738835/vovafisidipeveritir.pdfIn PDF document text
    • http://metinozub.iblogger.org/88747201987.pdfIn PDF document text
    • http://blancer.xyz/missguided_returns_after_14_dayszb5nd.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/how_to_set_butterball_turkey_fryer.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/tokit/jepeguwitekijudarabevi.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/34620024172.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/ralefosofovavori.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_off0000dbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC2 5376 bytes
SHA-256: 90e7e75f4aa70b5a8c631c39e5e6f2e2a7c8fe192dddb933db50b85f806b3432
font_01_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 10496 bytes
SHA-256: 1778da2239902d677e315f0cd600f8ecdbad3d712c49c37ad12eef93b987930c

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