Malicious PDF — malware analysis report

Static analysis result for SHA-256 422aa8e54bdfb6f9…

MALICIOUS

PDF

75.1 KB Created: 2020-12-25 22:22:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d5ab181d270f96c563712fe6cd0a80da SHA-1: 21c7f03abaac87d23db36b17702ce59c903ca05a SHA-256: 422aa8e54bdfb6f90affb099dd3cce4a5ba2049ed430bd072db8470ec20ccca8
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, with at least one redirecting to known malicious infrastructure (traffmen.ru). The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' further supports its classification as a phishing or trojanized document. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its lure, but the link farm heuristic strongly suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffmen.ru/strik?utm_term=ninja+fruit+slice+game+free In PDF document text
    • https://degevibuv.weebly.com/uploads/1/3/5/3/135316410/a80f90be83c89f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423442/normal_5fcb197488de4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466143/normal_5fad7c8b0c43c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_5fa9a19fe303d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f96f45cc70bc.pdfIn PDF document text
    • https://cdn.sqhk.co/gagufatemo/RON4iR5/doomsday_vault_seed_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402949/normal_5fadf75ff00c3.pdfIn PDF document text
    • https://cdn.sqhk.co/sevimifogu/hYFhjhg/tozudasapiravukevilomo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/figidireki/suvugifanetusefuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f617503-5e36-480d-89e1-8a903265f6ec/download_starboy_album_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd56822-408f-46fa-833c-6323d38bc707/algebra_3-4_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/salesforce_approval_email_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/wakobasigux.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/91407727645.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/interview_questions_and_answers_for_manager_hr.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000fa12.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFA12 21544 bytes
SHA-256: c7dbd7ec20edb7f2a7c0f3773a6e8c0104e3c0ca12215bcd40495a583f53182a
font_00_sfnt_off0000c53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53E 5244 bytes
SHA-256: 5d44ecf100be2cae25deba012fb9610470425ee737c3abb69723fd539559b521
font_01_sfnt_off0000d70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70D 10128 bytes
SHA-256: 607f3e653edb3b91b4c4b0279ba5005d6888b06555cfcf60081af23ae93998c2

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