Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4fc5facba43727…

MALICIOUS

PDF

75.1 KB Created: 2021-03-31 16:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c9debf9433e29fd93df6603713f74dda SHA-1: 1b03273df1973f22626cfd1be18d87195f1033b4 SHA-256: 1e4fc5facba437273782ab819ec64c813e73b386b7623cd89506e260ff6cb648
126 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. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be related to a sale advertisement, which is a common lure for such attacks. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=yamaha+portable+grand+dgx-500+for+sale PDF link annotation
    • https://lekemevegov.weebly.com/uploads/1/3/1/4/131410090/8d597a1ae7.pdfIn PDF document text
    • https://serewutedirafam.weebly.com/uploads/1/3/5/3/135339767/5382882.pdfIn PDF document text
    • http://mewudaguzexo.sportsontheweb.net/bethesda_system_cervical_cytology.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365525/normal_5fcfa466740d2.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/YegdGRS/bufimiwebiwul.pdfIn PDF document text
    • https://zorajifedimak.weebly.com/uploads/1/3/1/4/131437130/puwetaxe_ponosasuxexuk.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/hjGgihc/51346272056.pdfIn PDF document text
    • http://mosuzovopij.22web.org/how_much_is_a_route_44_cup_of_ice_at_sonic.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/FlS3jfe/missile_defense_flash_game.pdfIn PDF document text
    • https://zowukudikumo.weebly.com/uploads/1/3/1/3/131382828/14780.pdfIn PDF document text
    • http://nipokafusili.iblogger.org/class_11_ncert_biology_book.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/16751767556.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/mopad.pdfIn PDF document text
    • https://cdn.sqhk.co/buxoxurobewi/Thijbub/sharpening_stone_wheel.pdfIn PDF document text
    • https://cdn.sqhk.co/wemerofada/9Rufhbw/57314556778.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/how_to_use_slow_cooker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420748/normal_604a32b44e428.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/f373ded1-7fb4-4bc3-99fd-8063b7ae5ec8/womudufen.pdfIn PDF document text
    • http://xenezipulugiji.atwebpages.com/types_of_artificial_intelligence.pdfIn PDF document text
    • http://rozevilamires.rf.gd/pitixejurufokozago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c29494-5624-43bc-8ed7-436d0a90c691/vanity_fair_panties_clearance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecfb59e5-fe7b-4dbd-a22e-f5d71d7060fb/sandisk_mp3_player_wont_turn_off.pdfIn PDF document text
    • http://lesasesodimavun.epizy.com/92250882873.pdfIn PDF document text
    • http://zegemipufe.epizy.com/wuniwuzirewewudog.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_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 5920 bytes
SHA-256: 27993694663d001c1e8a0b4e14719c1238865e3c1eab9aecef7afb94f0ce5f7a
font_01_sfnt_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 11032 bytes
SHA-256: 5ae2426e059f0b1cc453969a778caa1891f2b5e7691308227abd0f541e7547cd