Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31a10e0641476bf…

MALICIOUS

PDF

83.6 KB Created: 2021-04-19 18:40:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bd62e0b69c4bff4c858295267441da8 SHA-1: 2a273ab21faf37ceb157e4cf810408b4cffe0b5a SHA-256: e31a10e0641476bfbac136cf0d82681340dbc63775169cdc5dcc9f0844aacdae
116 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as a malicious PDF, specifically identified as a phishing trojan. Heuristics indicate it contains a callback phishing lure, prompting users to call a phone number in a context of billing, refund, or security concerns. The embedded URL points to a domain that is likely part of the phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kuzutuzo.ru/strik?utm_term=que+es+un+plan+de+mantenimiento+mecanico
    • https://cdn-cms.f-static.net/uploads/4368250/normal_602068af0cf6f.pdf
    • https://cdn-cms.f-static.net/uploads/4476757/normal_60214f469f5b2.pdf
    • http://xiwakaravivomik.scienceontheweb.net/2454893135.pdf
    • http://zokidinodajives.getenjoyment.net/what_does_sunset_mean_in_the_outsiders.pdf
    • http://zakomuxoza.getenjoyment.net/autoclave_all_american_25x.pdf
    • https://cdn-cms.f-static.net/uploads/4472788/normal_600fdb9c2d34c.pdf
    • http://ratixopawem.mypressonline.com/advantages_of_charismatic_leadership.pdf
    • http://parazepurafeza.medianewsonline.com/sunbeam_heated_mattress_pad-_queen_g9.pdf
    • http://jirenaxapibetig.scienceontheweb.net/africa_toto_piano_sheet_music.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://defakulid.atwebpages.com/how_to_set_up_night_owl_security_camera_on_phone.pdf
    • http://sojusenetuki.onlinewebshop.net/sewagewobilefokawabe.pdf
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_f4006ecd70804884b935fcd96409d34e.pdf?index=true
    • http://damowepoko.myartsonline.com/69329955236.pdf
    • https://s3.amazonaws.com/lerezazo/what_font_to_use_for_chinese_characters.pdf
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_9b2ae950dac948c6b7eb06fa73ea3757.pdf?index=true
    • http://sukokovevaz.atwebpages.com/wirufowaxav.pdf
    • https://s3.amazonaws.com/julexekubaj/72085552872.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fee2.bin
bf07618f9b66df094ade05db1f852d173e620cb2ad844ac4600d3c265faead06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE2 1768 bytes
font_01_sfnt_off0001074f.bin
cc9ffd03dcb428eab5b6f2e57c23ea8fe4271fe5ea7f4d0374aa227ecf0a4edc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 5184 bytes
font_02_sfnt_off000118df.bin
791d1268801f303ff43f767628ad1d5a1c6f93e61716e7f25470fc24c6e66916		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 11992 bytes

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