Malicious PDF — malware analysis report

Static analysis result for SHA-256 7172b3b0f2b6bcf9…

MALICIOUS

PDF

73.3 KB Created: 2021-04-24 08:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aa43bb9c8bdc5b05c28df7eb440c66b8 SHA-1: 2a26bfe108d63f5527ef31ac0bd614de450e5df5 SHA-256: 7172b3b0f2b6bcf96a87e41bba9554629a9ae5f85a0d9679eed0c18adae42614
186 Risk Score

Malware Insights

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

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 0.9998

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://druttle.ru/strik?utm_term=dandelion+wine+ray+bradbury+characters PDF link annotation
    • http://zakosemej.mypressonline.com/48746836724.pdfIn PDF document text
    • https://bogatogofaz.weebly.com/uploads/1/3/4/7/134705351/zabuxog-pedejewop-xibep-lagole.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/XQigiig/head_ball_2_latest_version_hack.pdfIn PDF document text
    • https://zowomotoridaxa.weebly.com/uploads/1/3/1/4/131438570/gavelonowe.pdfIn PDF document text
    • http://noxitafevinuv.22web.org/vumulupurenida.pdfIn PDF document text
    • https://dodezugufiz.weebly.com/uploads/1/3/5/3/135331092/5f6ed.pdfIn PDF document text
    • https://cdn.sqhk.co/wememiguw/Hhiighd/bollywood_actor_quiz_games.pdfIn PDF document text
    • http://popisazono.getenjoyment.net/l_carnitina_inyectable.pdfIn PDF document text
    • https://cdn.sqhk.co/xomorenut/gfifhaT/slot_racing_sets.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/ijejdhf/digesiwotevex.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/cfjbRid/gmail_customer_service_support_phone_number.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pakidenekarudi.epizy.com/wusefez.pdfIn PDF document text
    • http://valikidaku.epizy.com/morphology_and_anatomy_of_earthworm.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/whatsapp_apk_for_nokia_x2-_01.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/calendar_may_2018_template_free.pdfIn PDF document text
    • http://fegugeg.rf.gd/99921348777.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_off0000df04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF04 5360 bytes
SHA-256: 635c96d1f425bc44e23a65aa9d6fcd3d6a58ab9307c681ef7b0bf8c4b705a681
font_01_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 10884 bytes
SHA-256: 91e5dc9b74d1a86b95ed2653ed5a04ee25116df11b306ec717951d16248825fd