Malicious PDF — malware analysis report

Static analysis result for SHA-256 2663255750f019e2…

MALICIOUS

PDF

71.1 KB Created: 2021-03-12 21:11:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f4c83bbf4f248df07a89164ffc68efb3 SHA-1: 20088f9ea21a978487349c0fb56ebc9b17118316 SHA-256: 2663255750f019e2519cd2d5b674364a8cb329d5db21f2068dcb1bedcbece604
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/strik?utm_term=7th+grade+grammar+test+with+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/pabefidinaz/ezjhJZu/15735103147.pdfIn PDF document text
    • http://imedo.ru/what_does_the_term_beautiful_disaster_meanee6t7.pdfIn PDF document text
    • https://ketabanajav.weebly.com/uploads/1/3/4/7/134707818/638aaac4.pdfIn PDF document text
    • https://muwudenejudazo.weebly.com/uploads/1/3/4/6/134677543/2d4426.pdfIn PDF document text
    • http://atlas-copco.su/background_eraser_tool_photoshop_onlinefteem.pdfIn PDF document text
    • http://yozi.store/braun_thermoscan_5_with_exactemp_instructionseilz7.pdfIn PDF document text
    • http://mantenancie.com/aluminum_hydroxidexiggk.pdfIn PDF document text
    • http://eurostore.info/1871244052897s7n.pdfIn PDF document text
    • https://likuwiwekadu.weebly.com/uploads/1/3/1/8/131857000/furiwus.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/jdhfugj/my_animal_spirit_gold_paparazzi.pdfIn PDF document text
    • https://dixufewopirar.weebly.com/uploads/1/3/0/7/130775961/3536741.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_9bbae42306bf4378870cea1ab2de0491.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/american_born_chinese_character_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa5f82c2-c4de-4e1f-81c7-9d950e7b2bda/jukala.pdfIn PDF document text
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_978551d3e284477ab66b727f0214f227.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5233ac-1dc0-443b-a43f-106947589f9d/53876135029.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/74133837405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f1db452-0916-427b-8c39-35459093f480/noginem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca437727-2ae7-4194-963e-e9efc10b2c73/my_heart_and_other_black_holes_ending.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD914 5500 bytes
SHA-256: 81c085c25c95c057b5bb84f5a694256ece999357f9dbbd0e8adb03155537f2bc
font_01_sfnt_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 10344 bytes
SHA-256: e794dcf553f8e3684ae745f32c682653ede8b14ae8f6eb7a42348de012cc50ce