Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d449fa4e333c75…

MALICIOUS

PDF

70.2 KB Created: 2021-02-21 05:20:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 88f7ff15a363a841806bb0a00523014d SHA-1: f9fd85753bc14532e5661cfdff9cecd2e795f128 SHA-256: 12d449fa4e333c75c30341c829800a01d3e939edb9e67bd294fb8f4a1c8fc48d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing operation. The embedded URL `https://maypoin.ru/strik?utm_term=amazon+senior+machine+learning+engineer+salary` suggests a lure related to job searching, likely leading to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/strik?utm_term=amazon+senior+machine+learning+engineer+salary PDF link annotation
    • https://cdn.sqhk.co/sufiwotag/WgifO3t/74867833490.pdfIn PDF document text
    • https://cdn.sqhk.co/wixumenez/vjbfhdo/bubble_pokemon_green.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/ijqjgjb/lightroom_presets_tutorial_pinterest.pdfIn PDF document text
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/1204583.pdfIn PDF document text
    • http://allfreebets.ru/19941123408cp2ye.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/ibhbifd/17142067749.pdfIn PDF document text
    • http://businessoutsourcing.info/how_to_learn_to_use_tarot_cardsrjl6i.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/19124684599shztm.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/86310109040g5hqy.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/jtfjesE/my_talking_tom_2_mod_apk_download_uptodown.pdfIn PDF document text
    • http://thailandlove.site/tajutisum927z.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/iqCjiua/hello_hero_epic_battle_coupon_code_2020.pdfIn PDF document text
    • http://prizinsta24.space/88278167585ir23o.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/8hfgiou/17572757825.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/getorofomu.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/avast_free_antivirus_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/5013619521.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_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 5356 bytes
SHA-256: c8ddda7e2d3916c5f852b392abf47192737cc70b8b2da17bdcd65ec445b8eb96
font_01_sfnt_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 10764 bytes
SHA-256: 69f4ef0bf4a89516f5564ad72ddaee7e50f78ef744066e45fca6bf26bda88d8e

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