Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6271ab8329f0112…

MALICIOUS

PDF

68.3 KB Created: 2021-04-04 00:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1c502d906f8b5c17fd7fb0c082c3583 SHA-1: bdc8bade1aa560d3fd13755dd5462cb212c621f3 SHA-256: f6271ab8329f011298fef42588fd9c0f845ca7db896b0c53f5b882da322eea0f
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, appears to be a lure related to popular media, aiming to trick users into clicking the malicious links.

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://yafferge.ru/123?utm_term=bahubali+2+1080p++malayalam
    • https://cdn-cms.f-static.net/uploads/4467273/normal_602f92cc4b6c7.pdf
    • https://static.s123-cdn-static.com/uploads/4479226/normal_5ff1eda55a2e2.pdf
    • https://cdn-cms.f-static.net/uploads/4453556/normal_60485809c5f6d.pdf
    • https://static.s123-cdn-static.com/uploads/4426815/normal_5fc5a7dfe5a1e.pdf
    • https://cdn-cms.f-static.net/uploads/4377403/normal_60469622a72f1.pdf
    • https://cdn-cms.f-static.net/uploads/4463262/normal_6065cdb469ce9.pdf
    • https://cdn-cms.f-static.net/uploads/4465403/normal_600fe1e68cae8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d6207592-6cd8-4f99-8530-d279f08a88b1/93339384567.pdf
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_f040b9fdd51048c8bf2619cc883e2a85.pdf?index=true
    • https://7322f44d-5cb7-45f5-8521-a79093f6ce74.filesusr.com/ugd/dd0890_0a234e8194da420bba8083646dc6b7d6.pdf?index=true
    • https://s3.amazonaws.com/dalava/gatehouse_electronic_lock_programming.pdf
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_1eb588cadf4b439b9dc0d48c508b179e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7bd19f42-5271-4bab-916b-bc71a58b3929/2007_chevy_impala_ss_for_sale.pdf
    • https://s3.amazonaws.com/loxopudizus/strong_acids_are_weak_electrolytes.pdf
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_337466ace2ab468a85ccced9882d2cfb.pdf?index=true
    • https://s3.amazonaws.com/nafamaragisek/lofufumagulejijelojezulus.pdf
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_7af1c3df29f849e0a6be1981826eda40.pdf?index=true
    • https://s3.amazonaws.com/tozaduliwubega/7881069987.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_off0000cc5f.bin
04960ac4658d5f50b725151d5bb2ebd2f23ea4c6a0db0c712b74ab58ef8725fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5F 5596 bytes
font_01_sfnt_off0000df4d.bin
748c20c9de18e486e6594193f81b53da5778f4beccd6568e725943d5e8bc2772		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 10364 bytes

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