Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0eda2faf881d710…

MALICIOUS

PDF

76.8 KB Created: 2021-03-01 20:19:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e0b8db8645bdd700537c1f2e652a081b SHA-1: fddfdc9dcd9a02b670ca92507fdadf711462906f SHA-256: b0eda2faf881d710e68dad1c7373286d1b06a886f09243c876ce6e7828c27247
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many pointing to disposable domains, characteristic of a link farm or phishing campaign. The document body, though heavily obfuscated, suggests a lure related to 'Ap style guide citations'. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/strik?utm_term=ap+style+guide+citations PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403262/normal_600278d90aece.pdfIn PDF document text
    • http://ourfanz.com/89560685233ki3wg.pdfIn PDF document text
    • http://fionainthefield.org/python_programming_language_book_fre8p9l5.pdfIn PDF document text
    • https://numuzobiw.weebly.com/uploads/1/3/4/5/134589566/5061715.pdfIn PDF document text
    • http://bonus332.site/checkpoint_interview_questions_imeditaqghod.pdfIn PDF document text
    • https://vijilipaguwojig.weebly.com/uploads/1/3/4/8/134872157/bf517.pdfIn PDF document text
    • http://banki-internetowe.com/47130821370rf8fy.pdfIn PDF document text
    • https://loropigofog.weebly.com/uploads/1/3/4/5/134595907/jemirawusefoji_seziwodofuja_dezowajibaz.pdfIn PDF document text
    • https://kupifima.weebly.com/uploads/1/3/0/7/130775493/nujaluti.pdfIn PDF document text
    • http://fitokapss.xyz/butterball_electric_turkey_roaster_manualajbzj.pdfIn PDF document text
    • http://powerhdniy.space/14150210673cnq0t.pdfIn PDF document text
    • https://mizitixas.weebly.com/uploads/1/3/4/5/134589849/026f515.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_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 5236 bytes
SHA-256: 82b054a567c2d747934f40dba169bb722693c1a8fca7c02aa18cdadf4dab9a45
font_01_sfnt_off000102c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 10624 bytes
SHA-256: 8276370e0229200b5210c683e6b5ab6f2877427bcdeb1bc181a2ebdb05230be2

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