Malicious PDF — malware analysis report

Static analysis result for SHA-256 500a9c14f307c1ff…

MALICIOUS

PDF

69.3 KB Created: 2020-11-11 18:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ff7fac65dbeb2102d7c64a028a7e7bd SHA-1: d514dc3e7b0bf0b7efc014ded646239710680bfd SHA-256: 500a9c14f307c1ffde175288065c8d9566538b1939a99fc5bfcbdb79f9ef3861
234 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including a critical alert for malicious redirector links and a link farm. The document body, though heavily obfuscated, contains text suggesting it's related to 'sinister egr delete instructions', and the presence of numerous embedded URLs points towards a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-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.
  • 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/123?utm_term=sinister+egr+delete+instructions
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/4160084.pdf
    • https://timonuwek.weebly.com/uploads/1/3/4/3/134383578/runolalivevitobupav.pdf
    • https://cdn-cms.f-static.net/uploads/4369161/normal_5faad049af323.pdf
    • https://cdn-cms.f-static.net/uploads/4421776/normal_5fa2349d58133.pdf
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f8a4d5e55dff.pdf
    • https://cdn-cms.f-static.net/uploads/4417208/normal_5fa9bcd2af6e5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dedinavesute/ximuzegawusibuzis.pdf
    • https://s3.amazonaws.com/pibajuwi/3145906297.pdf
    • https://s3.amazonaws.com/zupenafud/23725637970.pdf
    • https://uploads.strikinglycdn.com/files/3eddb7d4-9434-4439-8939-ec4408f8cdef/77984452732.pdf
    • https://s3.amazonaws.com/tenunud/their_eyes_were_watching_god_setting.pdf
    • https://s3.amazonaws.com/fejenijovekozu/61207271129.pdf
    • https://uploads.strikinglycdn.com/files/97747337-bb4f-479f-894c-647b51523951/34736272059.pdf
    • https://s3.amazonaws.com/robumuduluwise/antecedentes_penales_colombia.pdf
    • https://s3.amazonaws.com/wegugus/dirupozusikot.pdf
    • https://s3.amazonaws.com/senodiw/dragon_ball_z_dokkan_battle_apk_hack.pdf
    • https://s3.amazonaws.com/mubefula/aquarian_drum_heads_endorsement_application.pdf
    • https://s3.amazonaws.com/zarusegibitumet/27483480967.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_off0000d13a.bin
4bda984713332269ef7bffdeff1502cd97b27a9d1f2187f097798602560ab165		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD13A 5000 bytes
font_01_sfnt_off0000e24b.bin
3a4fe413068fa06d6133ef837f0c054646e1ea21b6a816ef7ef3d990648294f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE24B 10484 bytes

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