Malicious PDF — malware analysis report

Static analysis result for SHA-256 072fa882d5c10984…

MALICIOUS

PDF

77.0 KB Created: 2021-03-13 19:00:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 69f77a58ea8691129403597321aa2911 SHA-1: 2731cc1de6516270eb0fa30afabacdf60cdee0ca SHA-256: 072fa882d5c1098464826c24111d96d186d6e8ab822d03c9258e6023d3131efe
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 0.9995

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://pelibifir.ru/strik?utm_term=what+is+the+traditional+music+of+south+africa PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403428/normal_5ffc870e6699f.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunadegu/thfMohf/sushi_catcher_az.pdfIn PDF document text
    • http://gevixadita.22web.org/crazytalk_animator_free_full_version.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/sandisk_clip_jam_bluetooth.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/gKDjgic/torepekobigibodutobozeg.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/stories_of_the_prophets_al-imam_ibn_kathir.pdfIn PDF document text
    • http://devubowoku.mypressonline.com/zubovogesolobivolejasikib.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/73Qb8pb/zombie_blast_crew_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuruvew/bZNJ7f9/shaolin_kung_fu_hand_techniques.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/agejw58/88739230738.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/icjdgeN/waditipudetifeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_603537d93aef3.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/ihhjbgi/4404778030.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473619/normal_5fcbc01855caf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_fc7d3384802a471ebdc517e39d60ccee.pdf?index=trueIn PDF document text
    • http://kelujisulajow.rf.gd/warhammer_skaven_army_book.pdfIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_86745a47577e4a5697ae2e8b433925e9.pdf?index=trueIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_7bb6fcac25d14c75b50ba7225d8e37af.pdf?index=trueIn PDF document text
    • http://varoniwarovez.rf.gd/dajiwaluzinuverebujax.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_f03070f4a6824fbf994ca344ced155eb.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_7b528b80985e4aec972d8ca98b40b208.pdf?index=trueIn PDF document text
    • http://jalijoruki.atwebpages.com/32435989175.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_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 5272 bytes
SHA-256: 658d92a3ebdae05ffaaaec324817ae062537b4b3df7288e9b6d5d97bcde4805c
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 10724 bytes
SHA-256: c91b926abe8429b08d9b67085ab629eecf3c0b19ad41f49693d521c7b655a469