Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6bf30c1c476cf1…

MALICIOUS

PDF

71.5 KB Created: 2021-02-13 09:54:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 5417159424d7366cb32f8bb07772bf95 SHA-1: e52b4050385fdaee796624d7aeec382c593a3015 SHA-256: aa6bf30c1c476cf1060f6b5d4805a525c1476063f99eeea3fdbf3831e2fdf990
146 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains text related to 'Gwinnett county bench warrants' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to a malicious website. The presence of numerous external URIs and link farm heuristics further supports the malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.
  • 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://seumenha.ru/wix?keyword=gwinnett+county+bench+warrants PDF link annotation
    • http://vykupavto54.ru/survival_last_day_on_earth_tipsvoz2c.pdfIn PDF document text
    • https://cdn.sqhk.co/giwumazusew/iil97g8/kabugokawutonowi.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/f77dgjT/retro_series_popcorn_maker.pdfIn PDF document text
    • http://help-business-media.com/radio_flyer_tricycle_with_handlestoop.pdfIn PDF document text
    • http://sfr-webmail.com/nisuvolalezaporotalitk3ocz.pdfIn PDF document text
    • https://cdn.sqhk.co/xijisejes/higifjg/2021_cherokee_arctic_wolf_321bh.pdfIn PDF document text
    • http://trikotoria.ru/54824517257cn6jy.pdfIn PDF document text
    • http://wordwild-store.com/55_fwy_traffic_reporta4z32.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/n41jiqQ/ripolofavutax.pdfIn PDF document text
    • http://findattime.com/24062337968knr7.pdfIn PDF document text
    • http://lami-lashes.site/6186413736989i13.pdfIn PDF document text
    • http://loveantravel.xyz/tivimk23jj.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/retisovojor/77477983688.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/iobit_advanced_systemcare_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/56630278733.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/chaparral_pro_regular_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/casselman_river_fishing_report.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 5220 bytes
SHA-256: a6a84c4d831b93c3e8fdc993869f93f3fe0e6fb9b4cac22e10e7f3ad78f5b27b
font_01_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 10660 bytes
SHA-256: 371aa08263915ff5e91d58c4fc0631a3f71de579f9d607441beed2c4e068e7eb

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