Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf5effd8ba2d836…

MALICIOUS

PDF

74.5 KB Created: 2021-03-15 23:59:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 590dbc9d8ffec23a70bf5ae03c3d3633 SHA-1: 7ab48cf8f3143a777f9e4ac848b8a7904f19dd1e SHA-256: ecf5effd8ba2d836e3b43468858ccffff3f7f0fd20a3d4d1bfa89aa2170f6846
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to drive traffic to various websites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier flagging it as malicious further supports its malicious nature. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/wix?keyword=graber+bike+rack+assembly
    • https://dojudetokin.weebly.com/uploads/1/3/4/6/134613144/gagumurinerixite.pdf
    • https://betutoza.weebly.com/uploads/1/3/4/8/134899773/4424765.pdf
    • http://rabota-plus.club/scanner_innova_5610pdj3m.pdf
    • http://jofipifemu.medianewsonline.com/62558087661.pdf
    • http://grigolia-studio.ru/junikoxiwekra5.pdf
    • https://pitejuxupukure.weebly.com/uploads/1/3/4/5/134500798/bajofedop_lomugovagi.pdf
    • https://cdn-cms.f-static.net/uploads/4490539/normal_60219b606a8fb.pdf
    • http://gejedesoni.getenjoyment.net/hp_laserjet_p4015_driver_windows_8_64_bit.pdf
    • http://bugilinupapud.mygamesonline.org/tudagozuboxi.pdf
    • https://sazadasixitabe.weebly.com/uploads/1/3/4/4/134404720/e5d2866ac7.pdf
    • https://cdn-cms.f-static.net/uploads/4369793/normal_60295434c088f.pdf
    • http://peuly.xyz/lalki_chunariya_hd_video_song0kpnw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/72e07a9f-8310-405f-8d38-afa1fcc0bf41/auto_warranty_forever_reviews.pdf
    • https://uploads.strikinglycdn.com/files/091af633-2868-4012-8707-cf515b3aeb1e/mokopotililixo.pdf
    • http://ropupifalapoges.atwebpages.com/viper_turn_off_valet_mode.pdf
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_6bdbdf6a349c4ef0b0b575e12d285578.pdf?index=true
    • https://uploads.strikinglycdn.com/files/559bf04e-b54a-410f-96b9-62767490c348/bridge_cheat_sheet.pdf
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_e7eea31dd7b34cb88a783e5091f17e53.pdf?index=true
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_4b4866d35a0c442586f051c008e3d586.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3aee7ede-5a0f-4025-b749-5db9274047e2/how_is_queen_mab_described.pdf
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_25668c1f65ae4aaf837c3dd6b28bbb8e.pdf?index=true
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_b98e177254de4b15a482dbad02643dff.pdf?index=true
    • 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_off0000e7b5.bin
23741598204f502c245fc6f834b285122fcb2c03feb544d5609dd76ec3a60905		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 5280 bytes
font_01_sfnt_off0000f9a0.bin
f303aebe1fc93216cbfd2da232000b95f73eeba735709f84c7ce36323dedab57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 10192 bytes

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