Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ed4c11dd9f6a50…

MALICIOUS

PDF

74.5 KB Created: 2021-03-04 03:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 76c71c6d9298e431bffb6253084dc641 SHA-1: ea7135afdc6780db9f4960261632c2e6f9bc2cdb SHA-256: 82ed4c11dd9f6a50cbb0f00f5f8d0b3746040d7bbe86d490b78c359a9b5c8eb3
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, including one pointing to a known malicious redirector at 'dafemum.ru', suggesting it's part of a link farm designed to lead users to phishing or malware sites. The document body, though heavily obfuscated, appears to contain keywords related to technical manuals, likely as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/wix?keyword=hamilton+standard+hydromatic+propeller+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_602f37c081d16.pdfIn PDF document text
    • http://jisipajimeleja.22web.org/vtech_cs6429-2_troubleshooting.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418175/normal_5ff88a015f6ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427538/normal_5fe48e4b380b9.pdfIn PDF document text
    • https://kufesivewafe.weebly.com/uploads/1/3/1/3/131384244/rolifikabekuku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450043/normal_5ffe2a72f0491.pdfIn PDF document text
    • https://kodopikowi.weebly.com/uploads/1/3/4/6/134659436/3c696fb00a70b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_60183a622d7b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387706/normal_603b9b295fb6e.pdfIn PDF document text
    • http://maporivibadiwaj.iblogger.org/bolamuxaduliwosuwajavid.pdfIn PDF document text
    • https://zeruposizagaki.weebly.com/uploads/1/3/4/8/134854722/14e58722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496828/normal_600aac7e804b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xoluwemulejunow.epizy.com/norapupuke.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/financial_reporting_analyst_resume.pdfIn PDF document text
    • http://rowezezivifa.epizy.com/70517806672.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 5456 bytes
SHA-256: f728ff91ad9867b84945a2f8a83779d8f0a943768ffb9a01155c06cddfa4393d
font_01_sfnt_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 10788 bytes
SHA-256: 286d114a5ad8df2f33fbcc78ee8575b9c5a39aa036da87c17f4da888e79ee03e

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