Malicious PDF — malware analysis report

Static analysis result for SHA-256 11369fb0216ac16d…

MALICIOUS

PDF

71.7 KB Created: 2021-03-26 15:28:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdb35427f7f7d68dcae468ba4868c7aa SHA-1: b9b7cf7e207674272e6ea2922a35bb330d9fb678 SHA-256: 11369fb0216ac16d7e91da8e00611163a391a0f3699611236dd365a365bbb511
194 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 designed for SEO manipulation or phishing. The presence of a 'download' button heuristic further supports a lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and extensive link farm are strong indicators of a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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-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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/award?keyword=besame+mucho+guitar+tab+pdf
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/moramukedela-xunurosagi.pdf
    • http://wofurasosezisax.mywebcommunity.org/english_reading_skills.pdf
    • https://nolizusumebixaz.weebly.com/uploads/1/3/1/4/131438071/vutevedifed.pdf
    • http://fasekafalig.scienceontheweb.net/nazelibowimama.pdf
    • http://votapusi.mypressonline.com/chicken_biryani_recipe_in_tamil_language.pdf
    • http://nanamojuvimujo.medianewsonline.com/nezalonobogosu.pdf
    • http://kenugizi.getenjoyment.net/me_before_you_full_movie_with_english_subtitles_free_download.pdf
    • http://lamejix.scienceontheweb.net/90342328182.pdf
    • http://pazadixokumox.sportsontheweb.net/44801415468.pdf
    • http://siwupezomejen.getenjoyment.net/how_to_identify_a_pimp.pdf
    • https://rogefuza.weebly.com/uploads/1/3/4/6/134688393/ruzumanebe_suraxemi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_e2d9b770d4d54f60ada220e043a4b063.pdf?index=true
    • http://gavawekib.myartsonline.com/aims_and_objectives_of_research.pdf
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_2b8d10b8b5c84e958155a160f0ab965d.pdf?index=true
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_d7639635f7214986af6bfb9b4e398f59.pdf?index=true
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_749fdb0938ea4dd0b86beb61a97987a4.pdf?index=true
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_89358f1499994f3e8e2ab26dd006f06c.pdf?index=true
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_5271272c2a95403a98a72f1112912f8e.pdf?index=true
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_24d2eb594bd648aa8729fa01a98fb6a9.pdf?index=true
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_19ef412d215e491cb973ef98a4bebe6a.pdf?index=true
    • http://diwavubodinaroj.myartsonline.com/acrobat_download_for_windows_7.pdf
    • http://kadoxosin.atwebpages.com/farm_to_factory_womens_letters.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdad.bin
c0a342b68251c49816e24616bd1592f2b075fc680995bf1015ecb122503bc527
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAD 5500 bytes
font_01_sfnt_off0000e05f.bin
e6c9ae69a5fe1a7044005f71a8370c9e11d18a7254848caf35a3026edc210023
pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 10184 bytes
font_02_sfnt_off0001031b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 4324 bytes