Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a53f7a2943be77…

MALICIOUS

PDF

83.0 KB Created: 2021-04-05 15:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa042d90159a01301652d86b8ba11d05 SHA-1: c11a1c460c595f115bc0edd2488d5939e30a14e9 SHA-256: 57a53f7a2943be774c0e5ec8a33e05a17267057de5d93d4a0617465039780b6c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://midufefew.ru/strik?utm_term=the+world+of+the+dark+crystal+movie
    • http://legrand-spb.ru/xiwofewefeglugik.pdf
    • https://cdn.sqhk.co/sobexofap/ighdGqP/larva_memory_card_game.pdf
    • https://cdn.sqhk.co/lanumakefu/Ogihhih/free_download_sniper_shooting_games_for_pc.pdf
    • http://urologo.store/how_to_get_a_religious_exemption_for_vaccinesy5b3i.pdf
    • http://gadatoreneperil.mygamesonline.org/rilusozopes.pdf
    • http://megalit-korolev.ru/579803000287qs8h.pdf
    • http://zenajok.medianewsonline.com/panchatantra_golpo_in_bengali.pdf
    • https://tukitesajore.weebly.com/uploads/1/3/4/8/134891371/fexaresi_guduvag_zinemibaga.pdf
    • https://lozexisivebuzon.weebly.com/uploads/1/3/4/7/134702594/rotukunegavakojadad.pdf
    • http://newipufisatag.scienceontheweb.net/83747458705.pdf
    • http://my-favshope.online/52250660888hhncw.pdf
    • http://goodsun.fun/long_way_down_movie_ewan_mcgregorbr1tz.pdf
    • http://tofoxewesaxizuz.mywebcommunity.org/google_books_downloader_online.pdf
    • http://iqecoportal.ru/counter_strike_nexon_zombies_free_utorrentseoj4.pdf
    • https://cdn.sqhk.co/sugezigo/ibia3Dn/mod_game_zombie_idle_defense.pdf
    • https://sodukosikel.weebly.com/uploads/1/3/4/5/134598711/xutolomomove.pdf
    • http://felesatediz.medianewsonline.com/mokovetinubobe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_3670f84acf4e426b9135393b4fd146da.pdf?index=true
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_f9223d34c7a448aca8e46c7cf03375dd.pdf?index=true
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_bf50823135064b5596589b6666517278.pdf?index=true
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_a85bb1c50c284b3cb959037e08d06d40.pdf?index=true
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_1fbb4c4ce0204c068737bc428abda692.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106f9.bin
e7f38795331493d072f634a86845592e102adfd08581e20173346e4cd7245b2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F9 5528 bytes
font_01_sfnt_off000119b9.bin
657b04812603693c280cde90142b61dad2f40b2a1f746240d0caeb3d34ce4a48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 10840 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.