Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b35db5cfa500f8a…

MALICIOUS

PDF

72.9 KB Created: 2021-03-29 08:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daeaf1dadc3b4ed7f451ec91152d1549 SHA-1: 4ee00787a707d6ed7321a96508486e552cfdacee SHA-256: 9b35db5cfa500f8ac713265133159c4e5a272d2e8b046d7c5deb0d2f902631c9
184 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate documents, such as 'Aadhar card address change documents pdf'. The presence of a 'PDF_SEO_LINK_FARM' heuristic and multiple unknown reputation URLs indicates a strong likelihood of redirection to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/award?keyword=aadhar+card+address+change+documents+pdf
    • https://cdn.sqhk.co/dudugetogi/8nLigMC/65555443719.pdf
    • http://idealslim-ordina.site/phonological_history_of_english_vowelsvg6bw.pdf
    • https://cdn.sqhk.co/guvevifowo/sji5Gie/hover-_1_titan_ul.pdf
    • http://damita.fun/rationalising_surds_worksheet_gcser17zp.pdf
    • http://cetakchantek.com/827798776415d9ow.pdf
    • https://cdn.sqhk.co/letarezetap/glkiijh/37947139217.pdf
    • http://leftoutclub.com/tafilinovisatajazipaduw7ks3z.pdf
    • https://cdn.sqhk.co/gogefaman/452gfge/55675595968.pdf
    • http://lirinevewafa.mypressonline.com/automatic_gear_shifting_mechanism_in_cars.pdf
    • https://cdn.sqhk.co/jibanukagexa/jjcjjM2/python_3._7._2_for_windows_7.pdf
    • http://nigemutekilum.mypressonline.com/stringent_response.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_5a6925d626f24870a8879bc4f24c3a08.pdf?index=true
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_6d039009fc114a40b1fe798a293d3cd0.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_off0000de75.bin
57e55d372638eaf0dfce248a143ac5c36ae0f3997b83c5f66af3f4c255c5d688		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 5528 bytes
font_01_sfnt_off0000f114.bin
2b366bf936ac4e9836815885d7f9a3f296f3f736b2ecae9c502d0b13f69cc66c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 11028 bytes

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