Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78899645c6a98bc…

MALICIOUS

PDF

97.3 KB Created: 2021-05-07 14:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1daff36eeda9a825cdb7dc4948c187da SHA-1: 7f3661a5b468b7bb262b21342a9270571218c489 SHA-256: f78899645c6a98bceed5d7d46bc710430fcf412097d059e69095355f087f1191
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document body contains urgency-related language, and an external URI pointing to 'kuzutuzo.ru' was extracted. While no scripts were explicitly found, the PDF structure and the nature of the detected threat suggest it's designed to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=how+much+does+kirby+cost
    • http://fawetugamuxix.66ghz.com/ziruweguvezebafizovesasoj.pdf
    • https://cdn-cms.f-static.net/uploads/4502920/normal_605ac9adc0d9d.pdf
    • http://tanidoxipasodot.22web.org/stud_bolts_and_nuts_dimensions.pdf
    • https://cdn-cms.f-static.net/uploads/4449001/normal_603e9b79d6d8f.pdf
    • http://kabepuvilu.iblogger.org/66335877696.pdf
    • https://cdn-cms.f-static.net/uploads/4377112/normal_606690dcb0e4a.pdf
    • https://cdn.sqhk.co/rolileduvof/fqdhbgc/are_cations_positive.pdf
    • http://vomenelavive.22web.org/gilolelowozevesemuwiw.pdf
    • https://cdn-cms.f-static.net/uploads/4412761/normal_604d23c4729aa.pdf
    • https://cdn.sqhk.co/manuguwe/hgXhbxb/vajepijaz.pdf
    • http://totudini.iblogger.org/study_guide_questions_narrative_of_the_life_of_frederick_douglass_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4387406/normal_605804ba24787.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fofanab.epizy.com/what_are_the_first_five_books_of_the_new_testament.pdf
    • http://sipukerafabule.epizy.com/motorcycle_repairing_near_me.pdf
    • http://zidumaxatu.epizy.com/kadibupog.pdf
    • http://zidetunoz.rf.gd/watch_the_red_tent_part_2.pdf
    • http://daxararudivoxik.rf.gd/81599250070.pdf
    • https://s3.amazonaws.com/jonora/jisiketaxex.pdf
    • http://mekigutesazi.epizy.com/gbs_uti_treatment_guidelines.pdf
    • http://sugefikinubiku.epizy.com/apple_pencil_annotation.pdf
    • https://s3.amazonaws.com/biwuwukesazef/71122160408.pdf
    • http://dokuzijix.epizy.com/bsc_1st_year_notes_download.pdf
    • http://kovuzamizin.rf.gd/is_beauty_in_the_eye_of_the_beholder_essay.pdf
    • https://s3.amazonaws.com/julexekubaj/32276856441.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_off00013c75.bin
2ea30fd3453a987b33b4413f26fc0c6d5feb8b45a22bbed291659701dbcdfd3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C75 5296 bytes
font_01_sfnt_off00014e64.bin
29c9211c9545799576e25f2dd366fcc807d08df4314401d5db2a778d0db2ec4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E64 12072 bytes

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