Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c10dd9b2d4e6dd…

MALICIOUS

PDF

41.7 KB Created: 2020-11-07 06:07:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9a6bca4f20908a1f62b5dd72e52fb929 SHA-1: 98a465568409d1dd5e1e6e1e36061d1faffb562e SHA-256: 91c10dd9b2d4e6dd929043eb495687402cc43aad3e7bf46c5f0c7f3882cc8885
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, disguised as a recipe search result. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's a link farm designed to drive traffic to external sites. No scripts were extracted, but the presence of an external URL is a strong indicator of a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafficel.ru/123?keyword=potato+recipe+vegan+meals PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368750/normal_5f91594d7f969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f9d1d04418c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_5f98406522f3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450041/normal_5f9fa47f2d827.pdfIn PDF document text
    • https://zixokamewi.weebly.com/uploads/1/3/4/3/134386319/nawasamoda-gurude-reneloxinisedaz.pdfIn PDF document text
    • https://tumupexaru.weebly.com/uploads/1/3/4/3/134333537/wekagomovoze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xosegareka.files.wordpress.com/2020/11/lonubadojateva.pdfIn PDF document text
    • https://fimalul.files.wordpress.com/2020/11/xenikefeg.pdfIn PDF document text
    • https://pifakimep.files.wordpress.com/2020/11/fododuxuxinoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c673015-cd4c-4536-94fd-1c3a2f5b7881/musd_school_calendar_2018_2019.pdfIn PDF document text
    • https://xevibipujezi.files.wordpress.com/2020/11/the_education_of_a_value_investor.pdfIn PDF document text
    • https://falikajudepi.files.wordpress.com/2020/11/xafuze.pdfIn PDF document text
    • https://vamemileja.files.wordpress.com/2020/11/8265589573.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_off00006583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6583 5312 bytes
SHA-256: 74d7b57dab85c7d27e1e66430b84076abdfcbba5f2550833f06d7b84049bdd84
font_01_sfnt_off0000778d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x778D 10236 bytes
SHA-256: 396d88f0bc4b66381fb50b0cc752271cbc1e9eeea9699fe5b3cbe81324a919f7

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