Malicious PDF — malware analysis report

Static analysis result for SHA-256 809348f39d6c90dd…

MALICIOUS

PDF

75.5 KB Created: 2020-11-29 08:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 645286b41471c7b3755e25f6ff596b03 SHA-1: 53047d80abb84140a3c6acbf4ad79d46cc0cfd26 SHA-256: 809348f39d6c90ddd0259f47740c6f742be27e4e444aa75768a7387c2defd13f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to 'trafffi.ru', which is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious content, likely for phishing or to download further malware.

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-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://trafffi.ru/123?utm_term=chemical+reaction+arrows
    • https://cdn-cms.f-static.net/uploads/4474231/normal_5fb61d4b28ec2.pdf
    • https://cdn-cms.f-static.net/uploads/4457839/normal_5fa1f840ad5de.pdf
    • https://cdn-cms.f-static.net/uploads/4413713/normal_5fac0bd667475.pdf
    • https://gobisenuginofaz.weebly.com/uploads/1/3/4/4/134490447/lamebuzujuxabekufif.pdf
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/2435ced18afd39a.pdf
    • https://cdn-cms.f-static.net/uploads/4419003/normal_5fa41299ce5dd.pdf
    • https://voxepobar.weebly.com/uploads/1/3/4/6/134668427/8965729.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/minaxigevani/business_plan_writing_template.pdf
    • https://uploads.strikinglycdn.com/files/35e0e253-cd49-4ff1-ac95-41c6afd40c01/73033450111.pdf
    • https://uploads.strikinglycdn.com/files/69f52626-c6ef-4f76-b28c-e2f529104f18/functions_in_sql.pdf
    • https://uploads.strikinglycdn.com/files/a1594d89-85e9-4fc8-beaf-0baa17258a91/1998_rav4_repair_manual.pdf
    • https://s3.amazonaws.com/nazekisigiduz/poslaju_consignment_note_template_excel.pdf
    • https://s3.amazonaws.com/wewuxuviwar/golden_gate_theater_east_los_angeles.pdf
    • https://s3.amazonaws.com/temujonuwu/10th_class_math_notes_download.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c922.bin
a616760e60ed90b92d16efcd1c89026badd9f6d5bcfdd2124cab595b31e6253c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 4944 bytes
font_01_sfnt_off0000d9c9.bin
f7f044454b1562e994868fb7ce62e8dc8c2f5c3aca85bf87b3fe97433f871d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 10200 bytes
font_02_sfnt_off0000fcec.bin
ac25c7abadf3d834b528077f10001cd9709e52925924d3c33baf47ab236da278		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 16212 bytes
font_03_sfnt_off00011233.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11233 4324 bytes

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