Malicious PDF — malware analysis report

Static analysis result for SHA-256 4514925e2d83edda…

MALICIOUS

PDF

90.4 KB Created: 2021-04-12 07:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 97c5f7cbe87f6dbc236496d3eccb571c SHA-1: 5bfc3f15282231c5e5bc457248ecd90d815875ba SHA-256: 4514925e2d83edda2a7c7e15cc4d76aa3135cd0349e50a25352e46ee7528b583
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document 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 presence of external URIs and the overall structure strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crophysi.ru/strik?utm_term=weider+crossbow+for+sale+craigslist PDF link annotation
    • https://cdn.sqhk.co/kimejijomaki/AiYyif5/jbl_music_player_app_download.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/all_my_friends_are_still_dead_book.pdfIn PDF document text
    • http://giwudogor.scienceontheweb.net/vizoxunugomivezi.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/j1cNijN/doodle_run_mod_apk_download.pdfIn PDF document text
    • http://mesikigodijope.mypressonline.com/93811055574.pdfIn PDF document text
    • http://nazhivy.net/pugokogoguzalubogavuls8qkv.pdfIn PDF document text
    • http://ionatr.fun/how_many_calories_does_a_dunkin_donuts_iced_caramel_latte_have0n6y2.pdfIn PDF document text
    • https://metojonokodoto.weebly.com/uploads/1/3/4/8/134881876/vewej.pdfIn PDF document text
    • https://cdn.sqhk.co/fefavezevir/Cgfhiid/dustless_sheetrock_sanders.pdfIn PDF document text
    • https://xozejobe.weebly.com/uploads/1/3/1/4/131406614/104843.pdfIn PDF document text
    • http://poradoit2.site/nebesedamubofaxijuv11ykk.pdfIn PDF document text
    • https://fozabezadako.weebly.com/uploads/1/3/4/6/134639332/8109397.pdfIn PDF document text
    • http://botavubapisod.mywebcommunity.org/software_requirements_specification.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/ifigzwa/piwetakeluxanemiwanizepux.pdfIn PDF document text
    • http://ipoteka.net/73083271661gotb8.pdfIn PDF document text
    • http://vanlit.ru/bpo_real_estate_templateotgo2.pdfIn PDF document text
    • http://vostokzapad.su/gumopikumolubifitegikikih3g5.pdfIn PDF document text
    • https://cdn.sqhk.co/sovajepuxe/j4jfigs/zazugomaxibavuj.pdfIn PDF document text
    • http://shoppingyxplus.xyz/79703166144iahgc.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/a3c2c906-08e8-42d7-b816-8d275808e49b/80054116096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a40804-5528-43a2-adbd-22f18c10de0a/sizelowelaxabufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/628ddd0c-a03f-48d8-a630-f6272e166704/8817357258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d53ab111-4b81-44d7-bbfe-ea75c8633eee/weramuxejulukobenoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67a1840b-c167-4659-ba4b-36a2c4b02972/85505998481.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_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 5436 bytes
SHA-256: 638e1e4a51c0dca04334658592b60ce53144a0846b14b0475848787c13a910be
font_01_sfnt_off0001339a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 11280 bytes
SHA-256: a63d2645fa58eb59db267d67604b7ec54663455183a60c05b34145f429a79f0f

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