Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fcf19876305c09…

MALICIOUS

PDF

77.8 KB Created: 2020-11-10 11:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 212dd4c97da53874baa57c13d0e0d505 SHA-1: d211be53d5513ef3701d2f021372006fde0ddcfa SHA-256: 82fcf19876305c0908f58244ce0e7b3ed533fbdedc53f3ae12659e5b18c92e10
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to other PDFs, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier also strongly indicate maliciousness, likely related to phishing or malware distribution.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/aws?keyword=terrificon+2019+variants
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5fa08273bec79.pdf
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/lijevagig-nesurukoj.pdf
    • https://cdn-cms.f-static.net/uploads/4415308/normal_5fa1fb7d1bea8.pdf
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5f8a6ad71d466.pdf
    • https://cdn-cms.f-static.net/uploads/4372702/normal_5f95807411bf9.pdf
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5faa07df79599.pdf
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f9643d232b65.pdf
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f8c8f94f0a51.pdf
    • https://lituveso.weebly.com/uploads/1/3/4/3/134362288/sopomonutaga_nubaxuboj_wesofed.pdf
    • https://cdn-cms.f-static.net/uploads/4376125/normal_5f991e18a7af9.pdf
    • https://cdn-cms.f-static.net/uploads/4408170/normal_5fa9ec5dd9886.pdf
    • https://sozetodu.weebly.com/uploads/1/3/4/2/134265488/195cab92bd15.pdf
    • https://jopizogado.weebly.com/uploads/1/3/4/3/134317888/3cc04.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/3dc85730-ef42-408b-87f0-bf588fc7e382/furezalibe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d1.bin
c775090bb80e90660b23250d78ddee6cbacd6bb22eccbd64db2f3794cbc18b0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 5124 bytes
font_01_sfnt_off0000f440.bin
83274a732c94ea46ba15d2ae8bc0f9141334fa27c8acf0dd928be55caf7e67d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 11608 bytes
font_02_sfnt_off00011b27.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 4324 bytes

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