Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a9b8809fed99d6…

MALICIOUS

PDF

92.5 KB Created: 2021-04-05 15:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42510dbaba3c9324a55abf415ee47449 SHA-1: 5aa5d102d4feb7ec3512c8ba3647d2d1f8aa472f SHA-256: 77a9b8809fed99d6b13c0a0f3b8a3a1113ee11374bd5818bc6c89d142a60129b
96 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. It contains an embedded URL that, when visited, likely serves as a lure for the user. The document body, though heavily obfuscated, suggests a topic related to Minecraft, which is likely used as a pretext to trick the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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/wix?keyword=minecraft+chicken+breeding+guide
    • http://wotegop.22web.org/midudivebezozevabosi.pdf
    • https://cdn-cms.f-static.net/uploads/4369495/normal_605a387c9947d.pdf
    • http://sewakasatixori.medianewsonline.com/free_phonics_books_for_kindergarten.pdf
    • https://static.s123-cdn-static.com/uploads/4488569/normal_6008d56b558de.pdf
    • http://dipazekonowa.mypressonline.com/tegodogesizanatoxasuj.pdf
    • http://kedepoba.sportsontheweb.net/rest_api_documentation_example.pdf
    • https://cdn-cms.f-static.net/uploads/4420927/normal_6017713b01606.pdf
    • https://cdn-cms.f-static.net/uploads/4402280/normal_6045040862fb8.pdf
    • https://cdn-cms.f-static.net/uploads/4460071/normal_60673e6e61246.pdf
    • http://bewizasosu.sportsontheweb.net/pinawegovenomu.pdf
    • http://womovenum.sportsontheweb.net/old_ncert_book_of_biology_class_11.pdf
    • https://cdn-cms.f-static.net/uploads/4474752/normal_6016c981bceb0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nonivomiba.rf.gd/base64_string_to_js.pdf
    • http://kuzojepume.epizy.com/93814802268.pdf
    • https://s3.amazonaws.com/fadupazageraf/how_many_nitrogen_atoms_are_in_2nh3.pdf
    • https://s3.amazonaws.com/pazerogasarinu/bansidhar_ka_bhojpuri_gana_mp4.pdf
    • https://s3.amazonaws.com/gazitif/zuxalopatukawotigino.pdf
    • https://uploads.strikinglycdn.com/files/6b43746b-eb9f-4f7f-8713-c338673ac9ed/the_official_sat_subject_test_study_guide_in_physics_free.pdf
    • https://uploads.strikinglycdn.com/files/64127ac5-ee25-47f2-b898-044005864dab/ic_756_pro_manual.pdf
    • https://uploads.strikinglycdn.com/files/78045d87-e61a-4845-8b2b-c0d51834e4d6/william_wilson_edgar_allan_poe_movie.pdf
    • https://uploads.strikinglycdn.com/files/ea9f0dda-dd80-43c9-a5fd-6756c923d460/vasedirorejut.pdf
    • http://kodozudumov.epizy.com/dimuzigukukideba.pdf
    • https://uploads.strikinglycdn.com/files/65297595-0fca-4a57-acab-37fed1e90e1e/stocks_and_investing_for_beginners.pdf
    • https://s3.amazonaws.com/jevedijadiki/bengali_movie_free_hd.pdf
    • https://s3.amazonaws.com/gazijewevan/water_scarcity_in_egypt.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_off00012c82.bin
9f49194c6d0becaf8983ccec00b7e92ba02e06c9373bbf58e44be035a0880b2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C82 5280 bytes
font_01_sfnt_off00013e86.bin
320202adf46a1c6994b0fd85a171ccb775da9c8484dbdf2a36248af0ef6f1ba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E86 11236 bytes

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