Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c8fedf88c28db3…

MALICIOUS

PDF

134.5 KB Created: 2021-03-23 12:11:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 49b2851556b7fe8567a9c4623e203197 SHA-1: 84331eca7a5a3594b634bc986bef4a2b0f096b0b SHA-256: 56c8fedf88c28db3afbd4eec4a0d18c242fc52a9df91e93979a6c8bb945761ff
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 0.9991

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://vilenefex.ru/strik?utm_term=what+were+the+rulers+of+mesopotamia+called PDF link annotation
    • https://dudafizegananif.weebly.com/uploads/1/3/4/8/134864336/tubidaleluz_jozigo_bevum_nobumelefeju.pdfIn PDF document text
    • https://depuxozepol.weebly.com/uploads/1/3/4/3/134377374/vejixufoke.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/bicc_cable_glands_catalogue.pdfIn PDF document text
    • https://xufuluzigi.weebly.com/uploads/1/3/4/2/134266078/jibevadipak.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/jgihbz7/wolf_girl_and_black_prince_anime_netflix.pdfIn PDF document text
    • https://foramawebor.weebly.com/uploads/1/3/1/4/131410370/3078361.pdfIn PDF document text
    • https://cdn.sqhk.co/gevagedubop/jMcjc7y/total_war_thrones_of_britannia_gameplay_ita.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/Hgdijqr/tripadvisor_cuba_resorts.pdfIn PDF document text
    • https://cdn.sqhk.co/kebokeregim/qPhdJIZ/super_mario_2_egg_shooter.pdfIn PDF document text
    • https://cdn.sqhk.co/kurapobal/1ghwxPh/kevobawolatilorofowiza.pdfIn PDF document text
    • https://cdn.sqhk.co/zawileveruz/wjitqk6/71611891195.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://judafigot.rf.gd/gizirijosofanubipifav.pdfIn PDF document text
    • http://dasujisetojasel.epizy.com/11147780763.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/craftsman_garage_door_opener_keypad_not_working.pdfIn PDF document text
    • http://visobiwedixupip.rf.gd/pokemon_adventures_manga_order.pdfIn PDF document text
    • http://ketabigumowun.atwebpages.com/how_to_describe_an_insane_person.pdfIn PDF document text
    • http://vitupofelomar.epizy.com/nogemib.pdfIn PDF document text
    • http://ramivigemotaf.epizy.com/34835583488.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001da50.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1DA50 18724 bytes
SHA-256: 9687f4a54fed2c24d30beaa9772a683f71993f89fd96f54972d7439f366f57a9
font_00_sfnt_off00019636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19636 5500 bytes
SHA-256: a78be0288dfaef1726b05dd06af3dc971ee980f163eae683a113f140f08f290b
font_01_sfnt_off0001a8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8D8 15944 bytes
SHA-256: ce41b5f5614d5abe686d02ee3e82064b838069cc9057aa7c73f8a9734bf0db52
font_03_sfnt_off0001f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F83D 6676 bytes
SHA-256: a9f66ccb02f208e5015693ec156f1ccbdb1fe0e037ce2cc8b7eb876acc5603d2