Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a81a4d06d9af43…

MALICIOUS

PDF

86.3 KB Created: 2021-04-26 03:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60c57c6572c114fec30dcc46e3e386f4 SHA-1: b7e16b486986f7e9b13675cd2ec2b90a5808cbd1 SHA-256: 83a81a4d06d9af43b3be89510acd9da7e6d333ae880a8283f033fe8ae0ce1664
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 URI pointing to 'jacksth.ru', which is likely part of the attack chain. The document body, though heavily obfuscated, contains text related to 'recommended books for success', a common lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://jacksth.ru/strik?utm_term=top+recommended+books+for+success
    • http://setokanekema.mygamesonline.org/69670655996.pdf
    • http://jozipuvuwuzaj.mywebcommunity.org/can_you_get_american_truck_simulator_on_ps4.pdf
    • http://siwupezomejen.getenjoyment.net/22398715057.pdf
    • http://kazotapojiwi.mywebcommunity.org/adding_mixed_numbers_with_like_denominators_word_problems.pdf
    • http://gidonuvawugirid.medianewsonline.com/madinah_arabic_reader_book_3_download.pdf
    • http://jukojadijomefar.medianewsonline.com/98183831017.pdf
    • http://mekomob.getenjoyment.net/69665373353.pdf
    • http://mekujoviwe.mypressonline.com/82746763183.pdf
    • http://tepugorotewole.medianewsonline.com/garmin_vvofit_jr_1_waterproof.pdf
    • http://goligofalu.medianewsonline.com/haemolytic_anemia.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bajupigirosinaf.atwebpages.com/appalachian_trail_map_pennsylvania.pdf
    • https://s3.amazonaws.com/padosumifubobo/60997175300.pdf
    • http://jasunusemoki.onlinewebshop.net/zapixapodenopezizasiwona.pdf
    • https://s3.amazonaws.com/pizivurapab/7863651675.pdf
    • http://refusunono.onlinewebshop.net/88750146672.pdf
    • https://s3.amazonaws.com/jedadokuti/65103060763.pdf
    • http://pusapovewazigu.onlinewebshop.net/mtd_snowblower_drive_belt.pdf
    • https://s3.amazonaws.com/legesiliv/52565493195.pdf
    • https://s3.amazonaws.com/wowonesoribu/86841283127.pdf
    • http://sogurorirerew.onlinewebshop.net/kigamafam.pdf
    • https://s3.amazonaws.com/rurovikejigibu/cleenol_lift_furniture_polish_safety_data_sheet.pdf
    • http://dusameferadulo.onlinewebshop.net/public_finance_act_tanzania.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_off00010907.bin
606f57bb79bdc89a1fb3b8ca24155e5734a3c0dcb4b37a83d4beb575ddf3c910		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 4968 bytes
font_01_sfnt_off000119bc.bin
9362258dd6fdc2eae9cd2d42f44d48ee362fcce5008db5aecf885af013814db9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 10616 bytes
font_02_sfnt_off00013df4.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF4 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.