Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdeb0aa1a0a8e581…

MALICIOUS

PDF

104.8 KB Created: 2020-11-11 07:36:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce27d890c9ebc91a1c13ef0e54352b30 SHA-1: 102142cacc4f80c3a2dea1aef907e58edd0a6467 SHA-256: cdeb0aa1a0a8e581b447365e3b361a8a91aeda7ed2a90b5dc28a9a6decf5db0f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious domain ('trafffe.ru') that is likely part of a phishing or SEO manipulation scheme. The presence of a large number of external links, detected as a 'PDF_SEO_LINK_FARM', suggests an attempt to direct users to potentially malicious or deceptive content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to spearphishing.

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://trafffe.ru/strik?keyword=emmitt+perry+sr+obituary
    • https://fuwurugosudopo.weebly.com/uploads/1/3/4/3/134326966/gimunurom.pdf
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f889f8001872.pdf
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f87a0abd699e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8932f5fb-460c-41dc-90cc-244ca3ca8c08/understanding_credit_cards_worksheet_answers.pdf
    • https://s3.amazonaws.com/tojazudibumogab/zadubawidezelubaxa.pdf
    • https://uploads.strikinglycdn.com/files/3c6329da-37f1-4842-9bfe-ac91a66bdf2f/sacramento_general_business_license_fee.pdf
    • https://s3.amazonaws.com/roxawo/white_auto_parts_tennessee.pdf
    • https://uploads.strikinglycdn.com/files/c4596713-1105-4e5e-b1e6-1e4c506f0346/86390604424.pdf
    • https://s3.amazonaws.com/kufazete/how_to_create_a_war_game.pdf
    • https://s3.amazonaws.com/jolunenafobuw/fekoxisebovetosukoke.pdf
    • https://uploads.strikinglycdn.com/files/170356fc-16db-4acd-b781-253263000cb2/finosiwofiruvorinixese.pdf
    • https://uploads.strikinglycdn.com/files/27de1309-4bff-4485-b105-86e4d818a1fa/mpow_jaws_v4.1_bluetooth_headphones_manual.pdf
    • https://uploads.strikinglycdn.com/files/b04e9e7f-77df-4947-bb1d-6fd8b5be3db6/44204937325.pdf
    • https://uploads.strikinglycdn.com/files/1d174733-4f6c-4efd-a2e6-43bcc7f10a6d/29606266593.pdf
    • https://s3.amazonaws.com/zamuriza/15265091131.pdf
    • https://uploads.strikinglycdn.com/files/44f6be7e-4c65-476d-8957-46f10285c62a/82254143725.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014986.bin
bbf7f084800876cae9e41a2c82290b3b884dbe8ff9e9d8fedc96c620fe53eee6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14986 4908 bytes
font_01_sfnt_off00015a3f.bin
1d1d09cdc1d24d947f09eab5c825db73159fbbfd3e2fd53d0650c310d5ec96be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A3F 13404 bytes
font_02_sfnt_off000187fa.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x187FA 4324 bytes

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