Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d3169067a04c18…

MALICIOUS

PDF

78.9 KB Created: 2021-06-08 10:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f89f6ea1af53f8c2c1b802d418784435 SHA-1: c6a81d946bf6adf1e893bb740cb014762f7b07e2 SHA-256: 53d3169067a04c18cb00490fe9f1ae884d360d5f1972fc480bc2b0c5568cf7d3
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-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://laborke.ru/pbw?utm_term=warhammer+40k+kill+team+factions PDF link annotation
    • https://gefaturulabi.weebly.com/uploads/1/3/4/4/134487578/bopegixodozot.pdfIn PDF document text
    • https://funovupudejo.weebly.com/uploads/1/3/4/4/134473131/zebilexasulamu-pujalosokokudur-dunewexal-powuwubos.pdfIn PDF document text
    • https://gegadibiliwo.weebly.com/uploads/1/3/1/8/131871883/dukekanamefutiwi.pdfIn PDF document text
    • https://xupusunozad.weebly.com/uploads/1/3/1/0/131070799/mezedip.pdfIn PDF document text
    • https://panemomozig.weebly.com/uploads/1/3/4/5/134503052/nifivi-niputanizile.pdfIn PDF document text
    • https://xifuvago.weebly.com/uploads/1/3/0/8/130813557/nebiwi.pdfIn PDF document text
    • https://dirarogevuku.weebly.com/uploads/1/3/5/3/135351224/4f615206ee7.pdfIn PDF document text
    • https://lugarulanug.weebly.com/uploads/1/3/5/3/135383187/388456.pdfIn PDF document text
    • https://mapulanedubo.weebly.com/uploads/1/3/0/9/130969056/ropujularububarelega.pdfIn PDF document text
    • https://latovadavubu.weebly.com/uploads/1/3/4/7/134716683/daneb-xidodazekopo-gijel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76f08d2-064f-4b8a-bfa4-f33ef293fbe9/2002_honda_civic_owners_manual.pdfIn PDF document text
    • http://subazim.pbworks.com/w/file/fetch/144554841/64997987377.pdfIn PDF document text
    • http://tukosifana.pbworks.com/w/file/fetch/144827109/kojijuzafipapefujoxo.pdfIn PDF document text
    • http://dipoziw.pbworks.com/f/bujedomoxave.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/w/file/fetch/144823206/newuvapafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3edca8f6-ae36-4a0c-8ae2-facde059fe79/zudifikotugored.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/f/serving_it_right_bc_answers_2020.pdfIn PDF document text
    • http://pafesudive.pbworks.com/f/sadifuwofatufepoz.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/w/file/fetch/144785919/do_i_need_to_do_anything_to_prepare_for_an_echocardiogram.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/what_is_the_theme_of_ghosts_by_raina_telgemeier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd2920d5-59ec-40a4-a95a-d684c01bbefa/1984_webquest_answers.pdfIn PDF document text
    • http://zuwofig.pbworks.com/w/file/fetch/144538011/27537822253.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/ali_kundilli_2_hd_izle_1080p.pdfIn PDF document text
    • http://favixose.pbworks.com/w/file/fetch/144539772/2009_jeep_grand_cherokee_repair_manual.pdfIn PDF document text
    • http://tebejeloxid.pbworks.com/w/file/fetch/144424002/55442662685.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_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 5428 bytes
SHA-256: d5979ce68ea3796e0cd50e00f4a3c2c105f50ce73cb050b19208ec6f8e24a969
font_01_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 10588 bytes
SHA-256: a859314453d61080f09f06b86da1b05984e3712beba0b9e0555e847251e6824c