Malicious PDF — malware analysis report

Static analysis result for SHA-256 8958f6602c2ca4b7…

MALICIOUS

PDF

76.1 KB Created: 2021-04-04 22:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9902080afc2136e4a602a90ba2b5d510 SHA-1: dfdb8c533fbe03720e2590be4bcb843cf1f68096 SHA-256: 8958f6602c2ca4b77c1fcb52eb7cbb05161a71f07b82742ed1bf4687a5837a1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a large number of embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports the phishing lure, attempting to disguise the malicious links as search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://zajinet.ru/strik?utm_term=breville+toaster+oven+air+fryer+recipes
    • http://warixedivukinat.mygamesonline.org/2012_jeep_grand_cherokee_srt8_0-60.pdf
    • http://liwurivosopap.medianewsonline.com/zilixumipege.pdf
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5fe259952cab9.pdf
    • http://copyright-securityx.com/android_screenshot_app_apkaekpj.pdf
    • http://1fps.ru/harry_potter_book_covers_newydmxi.pdf
    • http://todayit.pro/make_lemonade_by_virginia_euwer_wolffgnylu.pdf
    • http://juwaniwabi.medianewsonline.com/english_to_marathi_alphabet.pdf
    • https://cdn.sqhk.co/mosepoxik/GghX9hf/king_art_of_fighting_gif.pdf
    • https://cdn-cms.f-static.net/uploads/4493881/normal_603c4cd226355.pdf
    • http://mogisut.medianewsonline.com/61420549042.pdf
    • https://cdn-cms.f-static.net/uploads/4465396/normal_6015104656834.pdf
    • https://cdn.sqhk.co/buzivafulet/IihDJKn/home_depot_milwaukee_6_tool_kit.pdf
    • https://cdn.sqhk.co/netimawifes/fjggdih/85686779536.pdf
    • https://cdn-cms.f-static.net/uploads/4426696/normal_6056a3c50cd26.pdf
    • http://sevastopol.sale/luneto3ej4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bolirazebaf.myartsonline.com/11096659725.pdf
    • https://uploads.strikinglycdn.com/files/3e18ac18-770f-4cee-bf40-03c9f37764b4/roxelipepilonovi.pdf
    • https://uploads.strikinglycdn.com/files/951f06b7-dc87-403b-8718-fbbec8c734a9/80857982323.pdf
    • http://vekejuf.atwebpages.com/lavazza_espresso_point_matinee_beverage_system_coffee_machine_m11121.pdf
    • https://uploads.strikinglycdn.com/files/66ed93a4-eff8-4751-b90f-d8a1d3658ede/79279926324.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4d.bin
50741d52b34f591bd1413cb9bc63e299791969b1072bb76bb032b5905eb71e3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 5220 bytes
font_01_sfnt_off0000fc2f.bin
7866806cb003c94c678740ec6a5cc4174ec48d0723becfc6142be77aef62aea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 11672 bytes

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