Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae93d2d44f6033fa…

MALICIOUS

PDF

96.0 KB Created: 2021-02-21 05:20:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b01c8b8569ec55e68dda44bd8475319f SHA-1: be7b5f365ad936e6c29a7981c9f03340f8d2ecf3 SHA-256: ae93d2d44f6033fabbd087f691c35a432328b59b8f58c04978f8a4989a67906e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=star+trek+chess+set+rules PDF link annotation
    • https://cdn.sqhk.co/nugofonavuf/jiRF3d9/44439408391.pdfIn PDF document text
    • https://toxafowusolele.weebly.com/uploads/1/3/2/8/132815148/luguwis_pekibusizukiw.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/7cbed.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/gijgjjB/bemuzebi.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/ichhioE/tomodezatufera.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/f81f9b.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/cghhiZo/pivumozoguganodukogigafix.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/cibiija/dilogifatozipusigif.pdfIn PDF document text
    • https://loxuvamozevu.weebly.com/uploads/1/3/4/3/134310095/6790265.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laganomezavarof.epizy.com/laniwemolis.pdfIn PDF document text
    • http://jifejibi.epizy.com/ap_biology_lab_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/45780010179.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/easy_worship_background_videos_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/auctionator_guide_classic.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/emotional_love_status_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/55401909376.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_off00013e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E08 5052 bytes
SHA-256: 906389f1f3b543a9cdd7342554ae70c5dd6fafd48d5939ae84fba94f244d1a7c
font_01_sfnt_off00014f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2C 10400 bytes
SHA-256: 94cb6fb3326625016923f95f7ead11a5e7eb935ff9ce89d534e06a7a19bfdebc

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