Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40af02afbfe1575…

MALICIOUS

PDF

70.4 KB Created: 2021-02-13 01:29:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 099ae35a42f0636420905bb620e3ab1b SHA-1: e3a001fd6f0c033652296185691e8b8ff127f3c4 SHA-256: a40af02afbfe1575eca9d5ee640d5d0a7a489a0ba16619c8e46853d4fb94aed3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, a common tactic for SEO manipulation or directing users to malicious sites. Heuristics indicate a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it with high confidence. While no scripts were extracted, the structure suggests it's designed to lure users to external content.

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/wix?keyword=2020+military+pay+chart+bas PDF link annotation
    • https://bokitixeloto.weebly.com/uploads/1/3/5/3/135344606/4345494.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479679/normal_5ff5a53d061fe.pdfIn PDF document text
    • https://widosogepe.weebly.com/uploads/1/3/3/9/133986955/gezemu.pdfIn PDF document text
    • https://salobomuxalevi.weebly.com/uploads/1/3/1/0/131070078/teragis_letubumisuxiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5fdbafc9e3105.pdfIn PDF document text
    • http://intekzafast.online/cartridges_of_the_world_free_downloadh7bh.pdfIn PDF document text
    • http://persequen.com/tojagojamokuxowejifuzz3lt.pdfIn PDF document text
    • http://spainwow.pro/biostatistical_analysis_5th_editionucgjm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482206/normal_602312cae410f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_60270278197c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366004/normal_5ff2aafb28f43.pdfIn PDF document text
    • http://fitness-ital.fun/66429953413wu3a3.pdfIn PDF document text
    • http://zathkatow.xyz/89374019177c4l7z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450514/normal_5fe6b3cd94ef3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://repeputowuz.epizy.com/ambedkar_law_college_chennai_application_form_2018.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_off0000cf18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF18 5592 bytes
SHA-256: 727ff693a31589b29302f0913b27128e28503fd325d73d81dc6f7c1958d7aeef
font_01_sfnt_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 13340 bytes
SHA-256: 5497646e92418b592c0b345ff9a94d10b4fdb78c915d452e35a119fac86cf9bd

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