Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b7bf6899edff49…

MALICIOUS

PDF

89.2 KB Created: 2021-05-17 11:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2991bc7d4e57bfd1e890a41e913b78b4 SHA-1: ddf070e9333d1850bc101f477094cb411d0913dd SHA-256: e7b7bf6899edff49451003351dede929e265ec0f8de40ef6c61e5dff14aa4581
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is part of a link farm, with numerous external links. One prominent external URI, 'https://xezojetit.ru/strik?utm_term=taylor%2527s+theorem+for+two+variables+proof', is likely a malicious redirection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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://xezojetit.ru/strik?utm_term=taylor%2527s+theorem+for+two+variables+proof
    • https://cdn.sqhk.co/sovokeduseb/8Y9hbhg/1646560677.pdf
    • https://bobubimusibobu.weebly.com/uploads/1/3/4/7/134715312/1d59c.pdf
    • https://cdn-cms.f-static.net/uploads/4385850/normal_601e4f6760f21.pdf
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/gevutu-sulofulokaku.pdf
    • https://zaxezoxixuj.weebly.com/uploads/1/3/6/0/136097133/423106.pdf
    • https://cdn-cms.f-static.net/uploads/4480749/normal_6010d8dc008e6.pdf
    • https://cdn-cms.f-static.net/uploads/4464735/normal_606a81d60c39d.pdf
    • https://cdn-cms.f-static.net/uploads/4495385/normal_602ee0e5848c0.pdf
    • https://cdn.sqhk.co/bajowekununa/hjhdU8G/united_states_atlantic_fleet_ww2.pdf
    • https://cdn-cms.f-static.net/uploads/4419194/normal_605f2a9935d09.pdf
    • https://cdn-cms.f-static.net/uploads/4384167/normal_606adc19a9f59.pdf
    • https://bozaxadoduzake.weebly.com/uploads/1/3/4/3/134306622/kadivosawa.pdf
    • https://cdn.sqhk.co/mumeriretepi/jhjjgcA/razovibodoratu.pdf
    • https://cdn-cms.f-static.net/uploads/4490974/normal_601f577d67ed1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lupuvogotog/states_of_matter_quiz_grade_8.pdf
    • https://uploads.strikinglycdn.com/files/7cb44191-e3ae-471c-920f-6168b989d5c2/fifty_shades_of_grey_goodreads_review.pdf
    • https://uploads.strikinglycdn.com/files/861e1298-1c71-47ae-98a4-4260cef946be/24953651053.pdf
    • https://uploads.strikinglycdn.com/files/2e48936b-3d04-4b6a-97cf-45211fde4c27/is_metro_2033_redux_worth_it.pdf
    • https://s3.amazonaws.com/napoledunadigo/semicolon_and_colon_quiz_with_answers.pdf
    • https://s3.amazonaws.com/wuvepilamamuse/zivajamufagoterojarodi.pdf
    • https://uploads.strikinglycdn.com/files/a6b57ec6-af63-4285-a8d8-2ad07fafb639/250_gramos_de_harina_en_ml.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/lefufopusemenesaveduvunu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010514.bin
6e3e3d8595b0d5eac0a3128dff10f7c57efa4b1e8a61eb479cf902eaa38e98df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10514 5516 bytes
font_01_sfnt_off000117d0.bin
e89bf3fa5139ce4693d22027ac4bc11b6d7dc0a584c667ff40bbc7c0b84c53c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117D0 11556 bytes
font_02_sfnt_off00013f97.bin
289dfb57f75ebb6093b8aa737dcf069916c02d3a12c86f106202c40eb53bdb22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F97 16296 bytes

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