Malicious PDF — malware analysis report

Static analysis result for SHA-256 670ec23369495b10…

MALICIOUS

PDF

79.5 KB Created: 2021-05-22 12:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 28791f865237e427c9e4ac47bd4cd2ec SHA-1: 450de185b35d9aecb5ff45c04067ca90616616af SHA-256: 670ec23369495b1074d7e1692940394ce1b61d638f71831b3fcc0d3e9ebcd5ed
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=teach+like+a+champion+field+guide+2.0+pdf PDF link annotation
    • https://jukaregexiw.weebly.com/uploads/1/3/2/8/132816195/matuvokige.pdfIn PDF document text
    • https://ladofozaser.weebly.com/uploads/1/3/4/3/134334290/gutudabafor_puwidevajovela_megabifiti_tivuvotiwenabo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489596/normal_5fcd281d3c4c8.pdfIn PDF document text
    • https://xoriforibeb.weebly.com/uploads/1/3/1/0/131071072/ledogubeniti_rowives.pdfIn PDF document text
    • https://didizotaxudip.weebly.com/uploads/1/3/4/6/134619455/0d273d2480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449181/normal_6003b5c2d5a8c.pdfIn PDF document text
    • https://zesadokalefon.weebly.com/uploads/1/3/2/6/132681767/2801715.pdfIn PDF document text
    • https://zawobulogu.weebly.com/uploads/1/3/1/0/131070044/83084466.pdfIn PDF document text
    • https://bajixaxazuxu.weebly.com/uploads/1/3/1/3/131383864/sifufitani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_606627fb1c9da.pdfIn PDF document text
    • https://nepibosumu.weebly.com/uploads/1/3/4/3/134363752/kagirovi.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/7efccace-a62b-41d1-b8db-fc2a8d22fc24/coast_guard_physical_fitness_test_waiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78332efc-df56-4119-b4a1-6930f298774c/40440527925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e1431d-0dbd-4c19-982c-c2ba7a2d363a/captive_meaning_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/91444712920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a60974f-605a-4874-9c4c-48367dfd048e/ipod_nano_2nd_generation_reset_to_factory_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/671c05d8-03fd-425a-a356-8bac0a0bd103/my_cloud_user_management.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/android_development_on_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ee1ae86-2436-434e-8d6f-51c8e82d6cff/commandos_behind_enemy_lines_game_download_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/why_is_dell_not_charging.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/zadebakunewokadige.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_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 5612 bytes
SHA-256: 4aa116d018b894bd729fa12f23b0a860a5ac2747cc1e53c1313ecd0f4676c65b
font_01_sfnt_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 14552 bytes
SHA-256: ffcacde623d4e0ea5b39ef6ddfc61716c6ac823f4d83c1fb711c1d954212e277