Malicious PDF — malware analysis report

Static analysis result for SHA-256 137b894717193535…

MALICIOUS

PDF

79.5 KB Created: 2021-05-03 00:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b39a88169427f31a20514dd6b7b26c6b SHA-1: 13935c0da52add6a5ecfa846a55d5bb10e877f3b SHA-256: 137b8947171935355057cfcf09c40b287e4d066ad93cd31cfff15d376c570a30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=poulan+pro+gas+blower+bvm200vs+manual PDF link annotation
    • https://cdn.sqhk.co/pixefavenar/xHrgfgj/43394292003.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/jgjh3ia/15107181689.pdfIn PDF document text
    • http://bujasap.iblogger.org/maineville_weather_report.pdfIn PDF document text
    • http://kifepivukog.iblogger.org/vokodukosilosovab.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/QzjhadF/98009468066.pdfIn PDF document text
    • http://merotudonor.mypressonline.com/ion_conducting_polymers.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxiwugo/4jiV0cM/33262407365.pdfIn PDF document text
    • http://gadivawiw.sportsontheweb.net/43773883272.pdfIn PDF document text
    • https://cdn.sqhk.co/batijuretak/JNggcvp/neo_geo_mvs_game_boards.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/gePjhaR/download_evil_rise_zombie_resident_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lafixafif/hiVn2uz/kekobuzoleniximig.pdfIn PDF document text
    • http://pexulabin.iblogger.org/98017727534.pdfIn PDF document text
    • https://cdn.sqhk.co/lonuxonemor/hf1ibhd/metformina_500_mg_emagrece.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nugejazozebosud.epizy.com/61326457021.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/foguwuwunugate.pdfIn PDF document text
    • http://pexevogawi.epizy.com/the_beatles_help_full_album.pdfIn PDF document text
    • http://wokarodefi.onlinewebshop.net/gosinagupewiboxifugaxobo.pdfIn PDF document text
    • http://gigegukamo.epizy.com/96773979754.pdfIn PDF document text
    • http://widepidaba.atwebpages.com/ultrasound_anatomy_of_lower_limb_muscles.pdfIn PDF document text
    • http://vizomonuzujo.onlinewebshop.net/14669761850.pdfIn PDF document text
    • http://peledopa.myartsonline.com/how_to_remove_disc_from_xbox_360_without_power.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 5708 bytes
SHA-256: 8f3fe1d05945ca561365478b7d4821e8fcab7a39c647120d09043c9b529b69f8
font_01_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 11380 bytes
SHA-256: 23f778c23450db909b988fc6941ebb32ddafc851ce82a39437364a6de3168229