Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6442259dc6228fb…

MALICIOUS

PDF

64.4 KB Created: 2020-11-20 07:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2793ad5f1226d22deb73df0c56ee4599 SHA-1: d5e90a45a546c2f8ac6f648ee41ab52b95988b80 SHA-256: d6442259dc6228fbb9807975ab840321bfbfeb2231f4b62abb3e54c10be6a6c7
174 Risk Score

Malware Insights

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

The PDF document contains a link to a known malicious redirector, and heuristic analysis indicates it is a callback phishing lure. The document body, though heavily obfuscated, contains text related to 'Lyon county mn warrants' and 'wkhtmltopdf', suggesting a potential pretext for the scam. While no scripts were explicitly extracted, the presence of embedded URLs and the phishing lure strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://cctraff.ru/123?utm_term=lyon+county+mn+warrants
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5fae3c951ec17.pdf
    • https://cdn-cms.f-static.net/uploads/4482190/normal_5fb38e0090761.pdf
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5f8d7c33c8c7d.pdf
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5f94a0f777996.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/robumuduluwise/moonbase_alpha_tts_song.pdf
    • https://uploads.strikinglycdn.com/files/055e1ee0-6642-4984-84ea-eaaef2e5daa4/vamu_in_english.pdf
    • https://s3.amazonaws.com/kewakuko/574908841.pdf
    • https://uploads.strikinglycdn.com/files/9337d649-d6d7-45a7-8017-f1dda6a35115/2985021053.pdf
    • https://uploads.strikinglycdn.com/files/726ed298-368f-4d84-932f-48c632024812/minitool_power_data_recovery_7.0_full_version_free_download.pdf
    • https://s3.amazonaws.com/bibejovixapis/android_adb_list_installed_apk.pdf
    • https://uploads.strikinglycdn.com/files/ae0c130c-65b8-4f2f-a3a4-db3402497e2a/nero_converter_free_download.pdf
    • https://s3.amazonaws.com/xuxifuzituwu/list_of_oil_and_gas_companies_in_oman.pdf
    • https://s3.amazonaws.com/zaxuledo/adsorption_and_absorption.pdf
    • https://uploads.strikinglycdn.com/files/d6268a9b-bec3-4011-b863-0fd3424c0ac3/89215074050.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_off0000c0f5.bin
dec5566b6e8a0e88e94151b820fe0b576411052d0059099c331ad4d4d357907d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F5 5048 bytes
font_01_sfnt_off0000d224.bin
8f4cdf59ad41b9380bbdd8651a5091993cbc1251a6c973878fd167b52bbcef29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD224 10180 bytes

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