Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bb9abe7e390e95…

MALICIOUS

PDF

74.4 KB Created: 2021-03-24 12:49:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac1fa5d784fa7a3942f31880142620e7 SHA-1: 57b9eda39a09f064b758ff838bdaf245b0f76dd8 SHA-256: a7bb9abe7e390e951c4ad6a97c20c1720967f2adb5c4726a9817911ef1eaf9e8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one pointing to a suspicious URL, suggesting it functions as a link farm or a distribution point for further malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=what+happened+to+lady+mary%2527s+first+husband+in+downton+abbey
    • https://static.s123-cdn-static.com/uploads/4408601/normal_6003b4ee828dc.pdf
    • https://static.s123-cdn-static.com/uploads/4448535/normal_5fe13212621c7.pdf
    • https://static.s123-cdn-static.com/uploads/4465705/normal_5ff7187cda6fb.pdf
    • https://cdn-cms.f-static.net/uploads/4475375/normal_601fccbac10b7.pdf
    • https://static.s123-cdn-static.com/uploads/4366666/normal_5fc76f5824a4b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fosalizuzu/zilutoxepewit.pdf
    • https://s3.amazonaws.com/wopari/98788064856.pdf
    • https://s3.amazonaws.com/nelizenejakarug/9400549615.pdf
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_3f18f474e6f2444b9f72efd76ea7a0bd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/12b4fb8c-ac77-4780-a813-6e3055a0595e/craftsman_table_saw_repair_parts.pdf
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_9dae75df92e74ee2bfdb9c174a87c2b1.pdf?index=true
    • https://s3.amazonaws.com/zobuwubedak/first_aid_certificate_template.pdf
    • https://uploads.strikinglycdn.com/files/22adb045-d8bf-451a-9cb0-aae7626cf058/nefupokubolizikatiz.pdf
    • https://uploads.strikinglycdn.com/files/ae8fb555-8778-4aa3-bd43-4fc7ce506d1c/90572863200.pdf
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_c8079e532ce34fa597607c886b15b1cc.pdf?index=true
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_f44aaa82bfbd4086822f651f1e284772.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e5749407-ae6d-4282-adab-f94d981cad86/baldurs_gate_2_enhanced_edition_classes.pdf
    • https://uploads.strikinglycdn.com/files/b76bed04-80d3-4efe-8ba8-1c7b5aca2921/tactical_medical_training_near_me.pdf
    • https://s3.amazonaws.com/vonusirukete/how_would_you_define_the_term_public_relations_2.0.pdf
    • https://s3.amazonaws.com/degagaziv/salimolujamake.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_off0000e3a6.bin
4345bda03e83573c7b264ac7b34c6a6e364d1408b4be53f05a4f53c421ce663b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 5660 bytes
font_01_sfnt_off0000f6d7.bin
0188b262c559de648ac54f6c3fde222885a25b7ce0671df79bdc37ae966bbd69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 10908 bytes

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