Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc6a85c578d731e…

MALICIOUS

PDF

81.9 KB Created: 2021-05-23 00:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3489235f7e115afa7fc18a3b75e65461 SHA-1: 68aaa1416d18f822292373e04e9ed93066b0b876 SHA-256: 0bc6a85c578d731e09abf2a48a4d9e51a6ef855b78dabd49365e22ba3d5b925c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link leading to a suspicious domain ('dafemum.ru') disguised as a game mod download. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded links and the nature of the heuristics suggest an attempt to redirect users to malicious content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/strik?utm_term=dragon+ball+z+supersonic+warriors+apk+mod
    • https://vabebixeteguju.weebly.com/uploads/1/3/4/2/134234611/ebf27.pdf
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/225b4e5badfc.pdf
    • https://cdn-cms.f-static.net/uploads/4408482/normal_6064b767e61ed.pdf
    • https://cdn-cms.f-static.net/uploads/4388063/normal_6026273282f2e.pdf
    • https://static.s123-cdn-static.com/uploads/4425912/normal_6003f58a6de04.pdf
    • https://rezepurobej.weebly.com/uploads/1/3/5/3/135327696/7551034.pdf
    • https://sokuvefababadax.weebly.com/uploads/1/3/1/8/131856373/jegojerowopa-tobeveguxom-jukugitap.pdf
    • https://patewolenapew.weebly.com/uploads/1/3/4/5/134525441/630b70.pdf
    • https://luzonenof.weebly.com/uploads/1/3/4/5/134509067/6268684.pdf
    • https://poxomovuru.weebly.com/uploads/1/3/1/3/131381772/8474056.pdf
    • https://zotagozugub.weebly.com/uploads/1/3/0/7/130739891/japital.pdf
    • https://muzobaxokeze.weebly.com/uploads/1/3/2/6/132682229/f6592fc149274.pdf
    • https://bubituzujolumet.weebly.com/uploads/1/3/4/6/134647672/dilokuwiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fekife/earthquake_newspaper_template.pdf
    • https://s3.amazonaws.com/jijumupade/45419691303.pdf
    • https://s3.amazonaws.com/mikibetiv/15845699104.pdf
    • https://uploads.strikinglycdn.com/files/d70008ea-91b1-450b-a528-28eac6c35033/gtx_1650_ti_mobile_vs_gtx_970.pdf
    • https://s3.amazonaws.com/wejuvono/azar_modded_apk_latest_version.pdf
    • https://uploads.strikinglycdn.com/files/a418fc80-adf0-4e19-866f-4d64fb0fd042/super_mario_bros_2_nes_guide.pdf
    • https://s3.amazonaws.com/numunenoji/90872007688.pdf
    • https://s3.amazonaws.com/bifamomove/bekemozumuzufigufufupikos.pdf
    • https://s3.amazonaws.com/gulapore/63650757136.pdf
    • https://uploads.strikinglycdn.com/files/59c85a78-e86b-4bdf-8f0d-3de346c4a7ef/bob_revolution_pro_vs_flex_duallie.pdf
    • https://s3.amazonaws.com/fapaga/rutakub.pdf
    • https://s3.amazonaws.com/daxemo/sewasapimilemomivabuse.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_off00010072.bin
fccb5e8b1bf78b460225b385d0da523d7014a9327fb720d4f6372ce647b97050		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 5736 bytes
font_01_sfnt_off00011405.bin
8d1d0c20fbef5c8496df4e94c0a27d3e0e27b85097ec3f60fda94ccd75221245		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 11004 bytes

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