Malicious PDF — malware analysis report

Static analysis result for SHA-256 0914369de3da3e49…

MALICIOUS

PDF

80.8 KB Created: 2021-04-04 15:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 663b4b70e40bc4ab12ed0d352671d268 SHA-1: 7753f4a143d66c74b24cf75085d2f6ec53980366 SHA-256: 0914369de3da3e49f998ce74ab4fa4d24bc0c9b7a7a385afbee0da92abb5042b
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious phishing content. It contains a large number of external links, suggesting a link farm or redirection mechanism. The document body, though truncated and partially garbled, appears to be a lure related to aptitude tests, combined with metadata indicating it was generated by wkhtmltopdf, a tool often used to create SEO-optimized PDFs. The presence of embedded URLs and the overall structure strongly suggest an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/award?keyword=uba+aptitude+test+questions+pdf
    • https://cdn.sqhk.co/pamezuravuno/AnGhaj0/best_paintball_marker_sniper_rifle.pdf
    • https://vasidigugadojo.weebly.com/uploads/1/3/0/9/130969577/424349.pdf
    • https://gunupilerupuva.weebly.com/uploads/1/3/1/8/131871796/9208858.pdf
    • http://raxejudesezix.scienceontheweb.net/counseling_skills_for_teachers_kottler.pdf
    • https://cdn.sqhk.co/marixefe/TreGeDJ/dominations_best_nation.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_7fd6aaf0330941f7974314d356a1ccd2.pdf?index=true
    • https://s3.amazonaws.com/vuliwisuwig/39662342961.pdf
    • https://s3.amazonaws.com/kofabube/fidunoduxupefipiginobavi.pdf
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_496c5a63e26743239bc2c2cb26c5b9c9.pdf?index=true
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_3982b36ccab14296a18f53ab53cda891.pdf?index=true
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_1533226369ba431aa28d9f3c5b5d36c5.pdf?index=true
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_0ec2f50a25674b4a9b8f8abd1d342b01.pdf?index=true
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_0eec42e6b7d0477aa3800e5bafcf927a.pdf?index=true
    • http://bekusisit.atwebpages.com/xukunomipodoxapenare.pdf
    • http://lojibovel.myartsonline.com/dizefidetuguxed.pdf
    • https://49f3a523-2ddb-4f17-a073-729d67a362fa.filesusr.com/ugd/18c683_434f342a5c3c410591bf69f3dc4eccf4.pdf?index=true
    • https://s3.amazonaws.com/wazagidonux/14215738039.pdf
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_618e6b75c901474483dcbb8ce1614f5f.pdf?index=true
    • 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_off0000fc96.bin
b81c532fd20cd8e3615840d7b994b5d6da9b8ca737bf89d01ac674e305917570		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 5164 bytes
font_01_sfnt_off00010e37.bin
ad261e6c8d0f99325ffbcf13e26c69e1c05a564ad544566b6891b1179df12610		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E37 11828 bytes

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