Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff82c7d22957801…

MALICIOUS

PDF

71.4 KB Created: 2021-03-11 07:02:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 969f0f78f53761ad036f22c4c3184346 SHA-1: 225dc50313c607415387c8d0ce920b24d2f2c019 SHA-256: cff82c7d22957801f4fb74a4f9e0c17d8bd332548850ee7073c9e4671d01a08b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, directing users to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to external resources for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/award?keyword=arguing+about+literature+a+guide+and+reader+pdf
    • http://fapasevusiledap.mygamesonline.org/sazel.pdf
    • http://zusiwibewire.mypressonline.com/how_does_montresor_feel_about_killing_fortunato.pdf
    • http://rijewomel.scienceontheweb.net/vajepo.pdf
    • https://tevunuxewime.weebly.com/uploads/1/3/1/4/131452804/bufojotep_tefenotejunu.pdf
    • http://lozajakar.iblogger.org/delonghi_lattissima_pro_instruction_manual.pdf
    • http://vijexibat.mywebcommunity.org/44258924584.pdf
    • https://zofoneparadi.weebly.com/uploads/1/3/5/3/135341866/ff36d78f1b433a.pdf
    • http://ronifibofizet.medianewsonline.com/sample_essay_questions_for_elementary_students.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e976c3c1-fe85-4717-b2e1-7bb62a40c724/how_to_use_igora_royal_absolutes.pdf
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_3a16f2a568d7435b8c5682fc010fd250.pdf?index=true
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_839cdc963a9f440692ea8c1adbe80765.pdf?index=true
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_acc29ab3c83a45618f16c161737cecd4.pdf?index=true
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_fdd2f62c6e534d66b62c8c419fe6fd2b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/35efadb4-2bda-4a07-87ce-6d04fc25e42b/control_de_signos_vitales_fundamento_cientifico.pdf
    • http://delonewafunedi.rf.gd/chhattisgarhi_hd_video_mp4.pdf
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_c2242936839d4e13b90be0e4eb5edc08.pdf?index=true
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_05ece02bb0194185bbf8d6d25591d57d.pdf?index=true
    • http://wekiwuja.rf.gd/bug_out_bag_inventory_checklist.pdf
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_8db45f7c6631409b86b04dde53be83ed.pdf?index=true
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_814857f4039541138527c1f1ff010c01.pdf?index=true
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_821fc5811102484082cebb3ab6ed386c.pdf?index=true
    • http://buvumurasamaku.rf.gd/avani_avittam_2020_mantras_tamil.pdf
    • http://fajamoluw.epizy.com/60593853342.pdf
    • https://uploads.strikinglycdn.com/files/045de223-1ef6-4846-878f-2354283ed57d/vocab_flip_book_template.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_off0000da15.bin
e9870b48be823a3b2d96dc4f48ea11c2b87be54a012f25b1e44bc0be24540136		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA15 5160 bytes
font_01_sfnt_off0000ebb4.bin
1a318dfd4d126795edbb2addebf25bcf9175f8b0e35a718270913d15d233a410		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 10504 bytes

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