Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32ae170c16fec73…

MALICIOUS

PDF

72.0 KB Created: 2021-04-22 00:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72e296f9b40dbc263e5f5475be039060 SHA-1: d275e89f6ca27c1fb530d57d045ed6a08e256a75 SHA-256: d32ae170c16fec73b4aa698e17aaad70db5e23bdf53b27da55ab7a56b5363348
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified as a link farm, with the primary URL being a lure for 'Spanish literature multiple choice practice'. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically phishing and trojan activity. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=ap+spanish+literature+multiple+choice+practice
    • https://cdn.sqhk.co/givesaxi/djeBhjS/74574632946.pdf
    • https://sesumevikenaful.weebly.com/uploads/1/3/5/3/135346106/8721628.pdf
    • http://tiwimifozukimu.medianewsonline.com/sejarah_kereta_api_indonesia.pdf
    • https://pudasebedizut.weebly.com/uploads/1/3/4/5/134587980/9649481.pdf
    • https://datedevob.weebly.com/uploads/1/3/1/3/131381982/a534c551cec3.pdf
    • https://zifalopo.weebly.com/uploads/1/3/1/3/131379769/rowib.pdf
    • https://jabezenenadako.weebly.com/uploads/1/3/4/2/134234778/wujoxukovo.pdf
    • https://cdn.sqhk.co/janurisu/xvhfQgf/tobafofelodidonobuzebor.pdf
    • https://bufitalusiwe.weebly.com/uploads/1/3/2/6/132682607/7d94b22c.pdf
    • https://cdn.sqhk.co/wodaximewule/bmHjcQE/92632413776.pdf
    • https://cdn.sqhk.co/konanetufuda/Ghaqwgj/oware_game_rules.pdf
    • https://sesirolomozanu.weebly.com/uploads/1/3/2/7/132741009/jijigumudekogi-vinororu-zajopo.pdf
    • http://vivudanu.scienceontheweb.net/class_11_chemistry_textbook_part_2.pdf
    • https://cdn.sqhk.co/mazoviwovusi/fHRigZL/direnefomanepufuvowewef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7cf4d950-1e02-45b9-8d59-52877d5e1cb1/ti-30xs_multiview_manual.pdf
    • https://uploads.strikinglycdn.com/files/715a971b-0472-489d-8c8a-4055e1814940/ac_repairing_guide_hindi.pdf
    • https://uploads.strikinglycdn.com/files/e33cb6dd-0b27-4d08-a292-9fb40d656157/14349386559.pdf
    • https://uploads.strikinglycdn.com/files/3cc29c8b-4d18-4708-8a8c-1bff0e338b1d/26401833152.pdf
    • https://uploads.strikinglycdn.com/files/29b24a09-a1f1-45ac-ae34-67f291bf58a6/which_of_the_following_is_a_theoretical_framework_commonly_used_by_social_workers.pdf
    • https://uploads.strikinglycdn.com/files/c6efae04-c821-4aa9-996b-1ced3dbd143c/56617274.pdf
    • https://uploads.strikinglycdn.com/files/57f3c80b-5926-4fad-b4aa-d79164e46d4a/68087430152.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_off0000dc63.bin
ff061aa8994f621169f4e36637d618e1d5bf9ace1220cd0b71fa75a8af6eca0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 5164 bytes
font_01_sfnt_off0000edc5.bin
5921d1f0f2c93e8453ecaf63d124f19d9263c898cde6f83527bd73ca743a2f7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 10648 bytes

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