Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83e8069dae5cd40…

MALICIOUS

PDF

71.6 KB Created: 2021-05-05 11:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 44aca20310fadeed32c748130dc15c5f SHA-1: 545e8a214d99643d6f945dd6857951ec34c95413 SHA-256: f83e8069dae5cd40343b55897c4835615b06e8617c566403439fab2b327848e5
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 0.9997

Heuristics 6

  • 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 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://pelibifir.ru/strik?utm_term=why+ti+h2o+6+3%252B+is+purple PDF link annotation
    • https://wokogosomexar.weebly.com/uploads/1/3/5/3/135322546/wujireboxisunut.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/gd99hhs/john_candy_rotten_tomatoes.pdfIn PDF document text
    • https://cdn.sqhk.co/suwixowefa/hKchGcw/zen_pinball_best_tables.pdfIn PDF document text
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/kobulufa-koviv-sufubawit-kasawafoj.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/dngfRub/43689532282.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/talovupalujowofij.pdfIn PDF document text
    • https://cdn.sqhk.co/mibaforetu/pghidgf/benatu.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzixapudel/bjjl6ig/nuxezenopaviwitele.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/idhjj7l/ganizokonalemutiwinut.pdfIn PDF document text
    • https://cdn.sqhk.co/milagaleja/ghdhhY0/stick_it_to_the_man_review.pdfIn PDF document text
    • https://voteweze.weebly.com/uploads/1/3/5/3/135346586/mirusobaxuken_numelapefa_xelanilodule.pdfIn PDF document text
    • https://cdn.sqhk.co/vopupevomate/5VhOTgg/wujun.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/136107df14eb.pdfIn PDF document text
    • https://cdn.sqhk.co/refimadaraze/hfxjhuX/portal_gun_mod_for_minecraft_pe_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/woxiwokujuwe/7iajcge/little_alchemy_cheats_2_in_order.pdfIn PDF document text
    • https://buvewetaki.weebly.com/uploads/1/3/0/7/130775635/lidor.pdfIn PDF document text
    • https://cdn.sqhk.co/xidodaxu/jidWDjF/roku_stick_plus_vs_premiere.pdfIn PDF document text
    • https://cdn.sqhk.co/dodalowogiv/ojhVhbu/92070395393.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_386d9379255d4406bd70044f3249c81d.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_86a058ace7284939a95a914c10832079.pdf?index=trueIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_08f857969b9e46b9b3eeb7f7486db837.pdf?index=trueIn 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_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 5260 bytes
SHA-256: 8bb6a4c284ff5c1af4cd16b67047fc98e7b763845ee559d0e4655acd10df6153
font_01_sfnt_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 10944 bytes
SHA-256: 0deddfb94fce33224a3362cd5e154a78b73ceecc2902e1e4354fce111994e85e