Malicious PDF — malware analysis report

Static analysis result for SHA-256 16901b0f198eb0cd…

MALICIOUS

PDF

74.3 KB Created: 2021-05-05 15:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25e82044c0919a67f389addc68457c2c SHA-1: 6d1fdc2cc99312ab363b68d7a9f4bc3d4c13d135 SHA-256: 16901b0f198eb0cd5af7ab17e6bda2517447180c11bb157a377028dee74b2d65
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an external URI pointing to 'zajinet.ru', which is likely part of the download lure. The presence of a visual download button further supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/strik?utm_term=2012+victory+vision+service+manual+pdf
    • https://kibirurifawejax.weebly.com/uploads/1/3/4/6/134610443/sefotevolilakovev.pdf
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/8b5e60a4.pdf
    • http://tokepubex.getenjoyment.net/auxiliary_verbs_do_be_have_exercises.pdf
    • http://dipazekonowa.mypressonline.com/94326471305.pdf
    • https://nenefifozotuve.weebly.com/uploads/1/3/0/8/130874038/72f6e1c7c.pdf
    • https://duxotitur.weebly.com/uploads/1/3/4/5/134596147/1460959.pdf
    • http://ferobuxanax.iblogger.org/driving_test_questions_and_answers_michigan.pdf
    • https://runewabelew.weebly.com/uploads/1/3/0/8/130813516/zupuxavowel_rokogelib.pdf
    • https://polavimiwusirew.weebly.com/uploads/1/3/2/6/132681763/d32ed4209a24.pdf
    • https://wamazuwo.weebly.com/uploads/1/3/1/3/131380988/dugekosabax.pdf
    • http://malafasa.iblogger.org/lazavig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vemudozuxara.epizy.com/abcde_del_trauma.pdf
    • https://s3.amazonaws.com/zonivezada/gramtica_inglesa_completo.pdf
    • http://nugagopi.epizy.com/actuarial_mathematics_for_life_contingent_risks_2nd_edition_solutions.pdf
    • http://pumejak.rf.gd/unicellular_organisms_examples.pdf
    • http://semowomeso.onlinewebshop.net/bayesian_statistics_in_python.pdf
    • http://diwisowaf.rf.gd/aliens_versus_predator_versus_the_terminator.pdf
    • http://fosupunejezaw.rf.gd/pitovasumumi.pdf
    • https://s3.amazonaws.com/wizomoravazub/how_do_i_program_my_wayne_dalton_garage_door_remote.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_off0000d94f.bin
3a99bfcc8a6322cb1f5d9dd0c76c95525b0630114fc12c53a342d41e6b6e0e01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 2960 bytes
font_01_sfnt_off0000e3bf.bin
ab4309d85a128a4057249405ebe1fd7eb658fac5063bf9ee60577ebffb5948ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 5692 bytes
font_02_sfnt_off0000f71a.bin
18dba6cca6aa597babc8071749fe23e3c2adc5fa57d30ba5d015221c56a64318		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 10748 bytes

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