Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ae8b5bb0a7c20a…

MALICIOUS

PDF

75.3 KB Created: 2021-03-29 16:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe8072d0b373903c3c6ed5541b8e13cb SHA-1: 519b70ac8ab1115b1744066de1f53466201aa3b3 SHA-256: 21ae8b5bb0a7c20a811c7db99d1ec11cfe6ee51faeae60d5b9db1d1f9a4d7c4a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, indicating a link farm designed for SEO manipulation or to distribute malicious content. One of the embedded URIs, 'https://seumenha.ru/wix?keyword=dubai+girls+whatsapp+number', suggests a lure for potentially malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the overall structure strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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.
  • 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=dubai+girls+whatsapp+number
    • https://zurufapejol.weebly.com/uploads/1/3/0/7/130739524/8943779.pdf
    • http://wemuwugisenoro.iblogger.org/2003_ford_focus_battery_light_on.pdf
    • https://static.s123-cdn-static.com/uploads/4378852/normal_5fdecd5bd3ade.pdf
    • https://cdn-cms.f-static.net/uploads/4481408/normal_60411bad4b228.pdf
    • https://jenajurowob.weebly.com/uploads/1/3/1/4/131408252/jevobafa.pdf
    • https://wagalivo.weebly.com/uploads/1/3/0/8/130814328/nivisotavetox.pdf
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/e45ab.pdf
    • http://fovagenifozemub.iblogger.org/how_to_pair_voice_remote_dish.pdf
    • https://cdn-cms.f-static.net/uploads/4389606/normal_5fe8ad806ac85.pdf
    • https://cdn-cms.f-static.net/uploads/4424007/normal_5fdadc1b15590.pdf
    • https://cdn-cms.f-static.net/uploads/4484636/normal_6012973dc4822.pdf
    • https://tamidotojo.weebly.com/uploads/1/3/1/8/131858916/b300d985548.pdf
    • https://cdn.sqhk.co/rowagana/dgjldm9/aprilaire_700_series_humidifier_manual.pdf
    • http://soxijijefarixij.22web.org/adobe_writer_license_cost.pdf
    • https://zibinileder.weebly.com/uploads/1/3/4/7/134748255/tugirovaradozuz.pdf
    • https://cdn.sqhk.co/jilebodetifa/Jijieji/dapimemo.pdf
    • https://cdn.sqhk.co/wepiwuvume/OghhqTa/26725026364.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/32778b32-7a43-4d67-9c15-5c6e3986511c/voruroxoreli.pdf
    • http://repofifimi.epizy.com/health_food_guide_awards.pdf
    • https://uploads.strikinglycdn.com/files/ca9d603f-a7b2-4666-b4f3-8e529207a0d8/crochet_bag_pattern.pdf
    • http://xuduvifeniwuzu.epizy.com/introduction_to_forensic_and_criminal_psychology_dennis_howitt.pdf
    • https://uploads.strikinglycdn.com/files/09d8115e-f5eb-4f11-81a5-04ade5e96681/83291319296.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_off0000ea94.bin
afe5b7cd63a383f1cf678a148093c2d95ab8ec0dac167795235c52eb0d79b5f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 5464 bytes
font_01_sfnt_off0000fd16.bin
d82b304c88f34548ea45c72ad4e7e529eb5bc6b212dfec116376a3357d14edde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 10300 bytes

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