Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc37c6724d851da9…

MALICIOUS

PDF

87.5 KB Created: 2021-03-24 09:55:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74398bd4f0aaa84d92220745f88f4150 SHA-1: c9472582cea57183649681f50ce70c0d9a4b2a91 SHA-256: bc37c6724d851da9683063ec883fcea7245a4c98fceb0cfc2d91163102e4524e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'jacksth.ru', which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to historical dictionaries, aligning with the external URI's parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=a+dictionary+of+british+and+irish+history
    • http://kijorifoweb.22web.org/pifijidebew.pdf
    • http://roflan.site/assassin_creed_rebellion_mod_apk_android_18grwq.pdf
    • http://webdefilmizle.com/apache_http_server_for_windowsk4tra.pdf
    • http://freshka.fun/wd_tv_live_plus_hd59b60.pdf
    • http://lupazul.mywebcommunity.org/26916501788.pdf
    • http://bitjoms.xyz/70148486259t8szs.pdf
    • https://static.s123-cdn-static.com/uploads/4496380/normal_5fcd572d8f407.pdf
    • http://activa-fb.com/soviet_union_constitutionmah4d.pdf
    • https://cdn-cms.f-static.net/uploads/4407318/normal_604146316efc7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zuwimadaneb/automatic_call_recording_pro_apk.pdf
    • http://fakodesugi.epizy.com/singer_s_musical_theatre_anthology_tenor.pdf
    • http://purewowesajumu.myartsonline.com/nivek.pdf
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_57069f9c54c945b29ef55abf2bddbcbf.pdf?index=true
    • http://pudedenos.epizy.com/odia_new_dj_song_2019.pdf
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_08b1f44eb3544bffba99ee9bf225a372.pdf?index=true
    • https://s3.amazonaws.com/dusined/bed_sets_king_sheet.pdf
    • https://s3.amazonaws.com/seriposuj/what_is_census_field_operations.pdf
    • http://zowetoxugikar.epizy.com/vugelododaz.pdf
    • https://592f3795-292b-4eb7-bb82-ca7d83343d16.filesusr.com/ugd/44d997_259e01e9865044008c7803d0f165d840.pdf?index=true
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_8ba9c8f610cb4ffea24be2615365a00d.pdf?index=true
    • https://s3.amazonaws.com/dovulavavo/nidigususamebiberokavigu.pdf
    • http://mijikudetixo.epizy.com/collapse_game_android.pdf
    • http://litorow.myartsonline.com/bobbi_brown_makeup_tutorial_2019.pdf
    • https://s3.amazonaws.com/jonora/apache_ant_windows_10.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7be.bin
387046be1094f5d3eb4cc86fb09b7207f853b4e84bbe13c948942f6f46e2d36b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 4980 bytes
font_01_sfnt_off00010890.bin
d2cc349d7898f0cad1e116c7e67d2531db2b977d18baca17b95e7f75b274e057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 10752 bytes
font_02_sfnt_off00012ce3.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE3 16060 bytes
font_03_sfnt_off0001417d.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1417D 4324 bytes

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