Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3eb6bdab38c4740…

MALICIOUS

PDF

63.6 KB Created: 2020-11-10 07:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0addf449303f16746eca8d72024e4859 SHA-1: d1af9ab78d4e52527342e5d909a1ed1e9748eafb SHA-256: f3eb6bdab38c47405bd99acea224983526dcaddb53dbecb2cf920dfa2204af49
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with critical heuristics identifying it as a malicious redirector and a link farm. The primary malicious URL identified is https://traffmen.ru/aws?keyword=phimvn2net+hau+cung+hoan+chau+truyen+tap+51. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffmen.ru/aws?keyword=phimvn2net+hau+cung+hoan+chau+truyen+tap+51
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/a34f66b2a5.pdf
    • https://nukoxifade.weebly.com/uploads/1/3/4/3/134332817/putebele.pdf
    • https://fexifeter.weebly.com/uploads/1/3/4/6/134612515/7086585.pdf
    • https://cdn-cms.f-static.net/uploads/4426696/normal_5fa9d1daab479.pdf
    • https://siduwetatipapi.weebly.com/uploads/1/3/4/3/134318549/nobowu-peboxaxabelav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/73a65269-a1c1-4030-b41e-0425759756dd/fundamentals_of_management_7th_edition.pdf
    • https://s3.amazonaws.com/kukazowox/suvixodekada.pdf
    • https://uploads.strikinglycdn.com/files/a5065d53-9fb3-48f3-8f09-bcccfc7a2e8e/what_is_a_certificate_of_achievement_degree.pdf
    • https://s3.amazonaws.com/tosasugokod/kemusoxelibopoxuzud.pdf
    • https://s3.amazonaws.com/vunizi/does_spectrum_support_roadrunner_email.pdf
    • https://s3.amazonaws.com/penale/ben_10_albedo_returns.pdf
    • https://s3.amazonaws.com/debiwelof/words_beginning_with_radio.pdf
    • https://uploads.strikinglycdn.com/files/1638ed63-fa52-4a28-b33c-2c1145ed49c7/40973580073.pdf
    • https://uploads.strikinglycdn.com/files/45d51f78-5a07-41f6-946e-e07d4d076ae3/12711044226.pdf
    • https://uploads.strikinglycdn.com/files/b21043e2-f0ef-4e8f-a9db-2288ec476963/79597901029.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_off0000baf5.bin
88abd3569be81b370c8ea8511c3be36f08fc60924e71799cd2b630556767b9eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF5 5608 bytes
font_01_sfnt_off0000cdf8.bin
0a0fb559096ab555121120e2441066de499a3b29264d9d9c738e9f119f1a0fdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 10616 bytes

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