Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ff338cb3fece58…

MALICIOUS

PDF

79.5 KB Created: 2021-02-12 19:05:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 00dfe4abbc59f2749b90248c828b76c0 SHA-1: 5bacf740c76898aeb7e5e5d44580ea30a90f9026 SHA-256: c0ff338cb3fece58d5f30218d23183a34594514be6414dce7d3f4fa8bbe761f3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

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://jacksth.ru/123?utm_term=horse+power+to+watts PDF link annotation
    • https://dofuzubakav.weebly.com/uploads/1/3/1/6/131606612/wonerelabitokabedi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_5fe61796410bf.pdfIn PDF document text
    • https://roserilufelojow.weebly.com/uploads/1/3/1/8/131856860/vivogerixarufoz.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/digjjDC/banamiloj.pdfIn PDF document text
    • https://tedifonag.weebly.com/uploads/1/3/1/1/131164063/6841075.pdfIn PDF document text
    • http://frankiearvelo.com/descargar_mma_fighting_clash_hackf24t0.pdfIn PDF document text
    • https://cdn.sqhk.co/somepizeko/okge0jb/meals_on_wheels_nyc_donate.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/SrGahj0/cfo_jobs_los_angeles.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/WFDiagj/fitness_point_llc_reviews.pdfIn PDF document text
    • http://choosemadam.site/what_to_say_when_you_talk_to_yourself_book8bk36.pdfIn PDF document text
    • https://gilurabad.weebly.com/uploads/1/3/0/7/130775641/091c6f432521ba.pdfIn PDF document text
    • https://cdn.sqhk.co/wisisatofife/erUjghj/shogun_hex_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466364/normal_5fcea39f586a4.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/oxo_chicken_stock_nutrition_information0dkk8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450516/normal_5fedcfa616046.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 4468 bytes
SHA-256: 190fbc45d5571d9e65e3bba2ea2f80ca3aa27795f60bdba3dd8147c2b4134ebe
font_01_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 10228 bytes
SHA-256: de62a930354fd125e3525f839aad7f91df04de203905ad657b0264cd1dfa3a91
font_02_sfnt_off000122f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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