Malicious PDF — malware analysis report

Static analysis result for SHA-256 d279724c9563dbf2…

MALICIOUS

PDF

118.8 KB Created: 2021-04-01 01:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b43b13b34ee52495d45718981d21881e SHA-1: d019366f8e29d9da740a960b9b56649cfafcbfaa SHA-256: d279724c9563dbf2fbf6f6febdf4c25c62b53c430987a87dbb3281c11b8d8ea2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a large number of external links. The PDF_SEO_LINK_FARM heuristic indicates it's part of a link farm, likely for SEO manipulation or to distribute further malicious content. The presence of embedded URLs suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=el+embarazo+definicion+pdf
    • https://cdn-cms.f-static.net/uploads/4495400/normal_6064e2e0c6089.pdf
    • https://cdn-cms.f-static.net/uploads/4366952/normal_6009df825ddbd.pdf
    • https://static.s123-cdn-static.com/uploads/4476946/normal_5ffdce211e9ea.pdf
    • https://cdn-cms.f-static.net/uploads/4406473/normal_605077d5eada5.pdf
    • http://zatoxuvisovapuf.sportsontheweb.net/church_of_the_flying_spaghetti_monster_bible.pdf
    • https://cdn-cms.f-static.net/uploads/4372073/normal_6062c0b250a55.pdf
    • https://bumifinanefisan.weebly.com/uploads/1/3/2/8/132814282/1299742.pdf
    • https://cdn-cms.f-static.net/uploads/4497368/normal_602e851abef08.pdf
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/betezo_doxuriruronejo_buxakununi.pdf
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/877548.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_d261e079c5d8406ab9ea2b2f69406d28.pdf?index=true
    • http://kusababi.onlinewebshop.net/oxford_cardiology_mcq.pdf
    • http://rolubumemetujin.atwebpages.com/lord_byron_biography.pdf
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_e5b9d6c00e594c4daddf18f88928857b.pdf?index=true
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_ead281fc55d4499988e238719907f5c1.pdf?index=true
    • https://a539eca0-ed6d-4e39-a9fd-63162facd464.filesusr.com/ugd/8170ee_f3113f07f8074212a46a05ea940b35b2.pdf?index=true
    • http://godusisoti.onlinewebshop.net/bushcraft_survival_skills.pdf
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_ee590cce21c045de8831c38e45ef5d35.pdf?index=true
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_ef8b3b8ae897450985889c05f53fbfb9.pdf?index=true
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_cbe157ad41334c638e791cdee5341f8b.pdf?index=true
    • http://pogetowem.onlinewebshop.net/64960794657.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018ffb.bin
fee63bc27b3bb6188f4968acd10c0c259847b4b19344fa1f1ef3aaf8f9ba3287		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18FFB 5272 bytes
font_01_sfnt_off0001a1d3.bin
d5106a3a5cd23a5536b2ff81efcd295f50a7a07d094cdc65ac8cb678e7185c29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1D3 13220 bytes

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