Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0946366bb7f796c…

MALICIOUS

PDF

76.8 KB Created: 2021-03-20 14:07:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c5f77fbb30318125ac2c00211177791 SHA-1: 116fb21fd6035d0b3561e9269550a3b04e545255 SHA-256: c0946366bb7f796c0e0d1210883e9a593c5069e877b8def6f3f0aac7b51229b6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a "PDF_SEO_LINK_FARM" containing 30 external links, suggesting a phishing or spamming operation. One of the external URIs, "https://vilenefex.ru/strik?utm_term=anesthesiologist+residency+salary+2018", is likely a phishing lure. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as "Pdf.Phishing.Trojan". Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing attack.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=anesthesiologist+residency+salary+2018
    • https://cdn-cms.f-static.net/uploads/4406776/normal_604c9f0700a6a.pdf
    • http://suwefazimim.medianewsonline.com/what_is_classic_style_in_interior_design.pdf
    • https://cdn-cms.f-static.net/uploads/4462341/normal_5fd3508071865.pdf
    • https://cdn-cms.f-static.net/uploads/4378608/normal_601b6069e7d63.pdf
    • https://cdn-cms.f-static.net/uploads/4492253/normal_601d00d0ba954.pdf
    • http://lamisorosasam.mywebcommunity.org/12052270762.pdf
    • https://static.s123-cdn-static.com/uploads/4472491/normal_5fee111a60f1b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/patotale/labazebogaxidijuba.pdf
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_d6b4b4f4f717467bb6926514aa9f2ab3.pdf?index=true
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_58de4ed5a08a4abca3367ef6c030f1b9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f1a8cb07-6a63-4c44-b4a4-ed9ca2525853/tamugababa.pdf
    • https://uploads.strikinglycdn.com/files/0662ccbf-2e92-4178-8366-7fcd140dc7fe/marimavetopaj.pdf
    • https://s3.amazonaws.com/daniwodug/english_file_advanced_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/35b07260-b22d-4998-b3d2-89653588bbd3/dirt_devil_cordless_hand_vacuum_reviews.pdf
    • https://s3.amazonaws.com/bezorito/67194291526.pdf
    • https://s3.amazonaws.com/fipijife/nilerupuzamofope.pdf
    • https://s3.amazonaws.com/gozilum/every_man_a_warrior_book_1.pdf
    • https://s3.amazonaws.com/zarelusipofox/49665208300.pdf
    • https://s3.amazonaws.com/luramamelolem/72244019494.pdf
    • https://s3.amazonaws.com/dobikasukavu/41535968623.pdf
    • http://keregimuw.onlinewebshop.net/how_to_decorate_open_concept_kitchen_living_room.pdf
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_6e258fcc2e8a442f9842d8d4c28d5a33.pdf?index=true
    • https://s3.amazonaws.com/ruzumeb/harmonize_kainama_audio.pdf
    • https://uploads.strikinglycdn.com/files/2a89dfa5-e097-4f79-9e02-e202626220ce/1476175141.pdf
    • https://s3.amazonaws.com/mutirexa/zudokutu.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_off0000ec51.bin
ff0b2b6d750d540cfc0f94f9cdfbdea9a13620671b5d67fd1734160399838f50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 5812 bytes
font_01_sfnt_off00010021.bin
5fa233c2269558d474fb4f6c5d31c3389ede11e7469017ae229e74e32474e3e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 10960 bytes

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