Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c588b67421d39b0…

MALICIOUS

PDF

76.7 KB Created: 2021-03-11 11:30:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7564afbbf82ce3b1933e9467c407d261 SHA-1: 1dca6d4ddb6ed4e8e0c7c21c96a215a26792c31a SHA-256: 1c588b67421d39b069059dd7a02f682963d768ed4a38b0f817e0b96a4bf5fd48
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

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://druttle.ru/wix?keyword=aplia+chapter+3+answers
    • https://radigaligoled.weebly.com/uploads/1/3/4/3/134333621/3357746.pdf
    • https://cdn-cms.f-static.net/uploads/4485157/normal_5fd1ca073ff23.pdf
    • https://vakilonote.weebly.com/uploads/1/3/1/3/131382032/burawokax-kojuwa.pdf
    • https://cdn-cms.f-static.net/uploads/4463300/normal_5fd79d8a01495.pdf
    • https://static.s123-cdn-static.com/uploads/4478132/normal_6000b21eb3738.pdf
    • https://noxagutut.weebly.com/uploads/1/3/4/4/134483949/xigoza.pdf
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/e8920f9.pdf
    • https://static.s123-cdn-static.com/uploads/4420600/normal_5ff2ba0e251d0.pdf
    • https://nadatipaj.weebly.com/uploads/1/3/5/3/135347779/sowuze_rumibudexajowak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5f44d5b8-09b0-4ef2-8902-7237495b33f1/avatar_the_promise_omnibus_uk.pdf
    • https://s3.amazonaws.com/wefemabeni/vuwuvigewumumizudom.pdf
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_45fb457261be45bfae5bfe4967476950.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6a927db9-2cb5-4456-9a93-e111cb989c82/44642508907.pdf
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_3bebc402acf54ecb87a3e850aaa60718.pdf?index=true
    • https://uploads.strikinglycdn.com/files/01ea3eca-f5a0-4368-b4a6-56820ba485a2/fuzzy_lookup_add-in_for_excel.pdf
    • https://uploads.strikinglycdn.com/files/6aa2eb63-f1f8-49c3-9865-29d367137733/kikesuvanorijasute.pdf
    • https://s3.amazonaws.com/gajabedafot/what_is_the_best_hdtv_amplified_indoor_antenna.pdf
    • https://s3.amazonaws.com/zoxewudunigus/captain_crunch_pc_game.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc66.bin
b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC66 6744 bytes
font_01_sfnt_off0000ed4b.bin
94fc5291bbee0c127eb92d9a0aa7b55fe3f5e533b66d5686e7a9b5205394970f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 5264 bytes
font_02_sfnt_off0000ff3c.bin
04b0890a7d80074e0a3a06089487b463f1bea9d50089e0973ff91671a353ade9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 10556 bytes

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