Malicious PDF — malware analysis report

Static analysis result for SHA-256 843632c6ee19556f…

MALICIOUS

PDF

68.3 KB Created: 2021-04-24 12:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a51ce1d7243f84ea5cf571599c6fbcb SHA-1: 73a5744e0a6b4cd4c62b3580e3f0f625d0f4f6e5 SHA-256: 843632c6ee19556f67a51d66fe94a75f3c0c209bf92982fcdb8af485bf06fc1d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to link farms, indicating a spam or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=how+to+review+math
    • http://sasabigewoku.iblogger.org/ryobi_18v_brushless_chainsaw_review.pdf
    • https://bazulerijodinib.weebly.com/uploads/1/3/1/8/131856415/zavaxivak-nolesotukirev-bisazetazutagip.pdf
    • http://desepevadijowu.22web.org/criminal_case_mod_apk_rexdl.pdf
    • https://gomisixazu.weebly.com/uploads/1/3/1/4/131437427/7300832.pdf
    • https://dejoputaxili.weebly.com/uploads/1/3/4/7/134763817/tepokuxewitawabiw.pdf
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/5058351.pdf
    • http://ledabojuvogo.22web.org/carotid_doppler_report.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f27656f8-ba5c-411a-a4a2-1587454f5748/vonirixijizidugopexerefex.pdf
    • https://uploads.strikinglycdn.com/files/6c557b7c-ff9d-40d5-a299-46c0cba90d36/calculadora_casio_hr-100tm_manual.pdf
    • https://uploads.strikinglycdn.com/files/0294ee6a-95ce-4b69-8bdb-ba96499f3374/dyson_dc50_parts_australia.pdf
    • https://s3.amazonaws.com/dosalapasenow/subaru_3.0_h6_problems.pdf
    • https://s3.amazonaws.com/kavifunaruvi/kuborekejipapolezud.pdf
    • https://s3.amazonaws.com/dogevazapiwediw/17536108330.pdf
    • https://uploads.strikinglycdn.com/files/827caf4d-e66e-4000-be82-ac0f6a1b42cd/7156027380.pdf
    • https://uploads.strikinglycdn.com/files/d28c123c-cabb-46e9-b0f4-af4158403b4b/positive_impacts_of_shield_volcano_eruptions.pdf
    • https://uploads.strikinglycdn.com/files/8ac384ca-fb03-4eec-bae9-5e396b990cd9/netgear_prosafe_fs105_installation_guide.pdf
    • http://tokegavewori.rf.gd/sirozafiredubojem.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_off0000d079.bin
6baa8bd95d18762b7a09009afc0e7db4a32b6076b69d30713a873b9743a79ae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD079 4828 bytes
font_01_sfnt_off0000e0c7.bin
bb97f0341a3c843952ab8b71faeaa6fef6bdbe79f93bcec65d8c8ac48a98db6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 10544 bytes

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