Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f04984c574e6ef…

MALICIOUS

PDF

70.7 KB Created: 2021-01-08 22:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c48a59af6489e2028d77551e098347c SHA-1: 709d34b4481e724b349127f4dd9d50c40fe611a7 SHA-256: 55f04984c574e6ef504ef6752238dff96cf1165e8d0284a10777894debe7a9fe
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on link farm domains, indicating a likely attempt to direct users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an exploitation attempt, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffking.ru/123?utm_term=rodanfi%252Alds+customer+service
    • https://denasigetul.weebly.com/uploads/1/3/4/3/134332190/kiwijuzuduvovu-bumolazewakerum-fejiweb.pdf
    • https://static.s123-cdn-static.com/uploads/4453550/normal_5ff441e027932.pdf
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/fibipakarikobeg_mozek_guxif_voledesuv.pdf
    • https://lozezuxugi.weebly.com/uploads/1/3/4/0/134016676/xazojolokagir.pdf
    • https://jerezuwiwufuken.weebly.com/uploads/1/3/4/3/134355676/2353011.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zevutebulaworel/dasujusukapesupilugikojar.pdf
    • https://s3.amazonaws.com/zemigiduwagafu/befirumiripafefivobawafo.pdf
    • https://uploads.strikinglycdn.com/files/3fad9424-83df-471f-8363-d6fb9d1b3dd9/caryll_houselander.pdf
    • https://s3.amazonaws.com/ruzaganog/42916307997.pdf
    • https://uploads.strikinglycdn.com/files/c57cfa2c-4ebe-4ec7-a00d-76a23a724a96/quickbooks_general_ledger_report_example.pdf
    • https://s3.amazonaws.com/julexekubaj/full_hd_movie_site_name.pdf
    • https://uploads.strikinglycdn.com/files/b176e526-a31a-4dbc-943c-cb2a8323f204/61521277902.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_off0000d6dd.bin
5b66df679ff9c9d19ebdfa1dd886d966ddc61668877b7db4435d536630fd74f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 5304 bytes
font_01_sfnt_off0000e8f1.bin
5fb61482b8b8b83db724689f2d172342434834851e5fed983f5549cd660343cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 11044 bytes

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