Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b24c86df72e17d…

MALICIOUS

PDF

75.1 KB Created: 2021-04-02 01:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0894ff271b164fa0c29decca18724037 SHA-1: b0200e6e968f517d5194daf18e2d93a454c5a236 SHA-256: 41b24c86df72e17d431044f1b1086770cec3b89c35bf9f6a2170bad18cd73aab
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata that appears to be part of a lure, possibly related to search engine optimization or directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/strik?utm_term=1996+ford+555d+backhoe+weight PDF link annotation
    • https://cdn.sqhk.co/rolileduvof/hbe7ict/drills_to_improve_field_goal_kicking.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402724/normal_6032f1ad7fa8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_604de60ce60d2.pdfIn PDF document text
    • http://uose.xyz/asmaul_husna_dan_artinyaorqzx.pdfIn PDF document text
    • https://cdn.sqhk.co/xekowodu/izhgAge/kilagetutoxebesavexom.pdfIn PDF document text
    • http://kawlites.online/62753712003vps36.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/ijejjdz/35592477358.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/hjg5zjg/download_world_war_1945_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/satasevubu/C4Ehijd/police_horn_dj_song_download_mobilekida.pdfIn PDF document text
    • http://gatorama.site/dulebezojagobaxiwewikusp33ja.pdfIn PDF document text
    • http://apeech.ru/nevojudeta586nu.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/0jhjhUl/download_html_code_play_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/egdjdz6/cookies_must_die_last_chapter.pdfIn PDF document text
    • http://firstsecu-paypal.com/7531516976610b47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468530/normal_60664adfafed3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454161/normal_605576d0e5ef7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_4652be2869e048aeb1790340ab513ec1.pdf?index=trueIn PDF document text
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_a00beb19aaab41b88356a618c782a17b.pdf?index=trueIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_fa639bb9bde1497895f752ddc18ada59.pdf?index=trueIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_42541746fbe24892876c923d764e16ea.pdf?index=trueIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_06270dd0966f4206ba959f3549e484c9.pdf?index=trueIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_3c7f54da9d974ec5aae3042b13ee1ec4.pdf?index=trueIn PDF document text
    • https://cdd249b8-77b1-4a94-b024-8995efe4d959.filesusr.com/ugd/d394ff_d7e07bf69d874eadaa7df157c71a12f8.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_off0000e51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 5760 bytes
SHA-256: 182aace66123ae3bc336d1819d87805bb1696ef18546ca9333a91a93c132a04f
font_01_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 10992 bytes
SHA-256: ceccd05d02ea7e9637761b221dffe5498f724964dd01a3c7a5ffb050d4ac90dd