Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f29aef55fe5b97…

MALICIOUS

PDF

80.7 KB Created: 2021-03-12 12:14:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 42db7dfa11bc7a15b2a5aafc0105ea50 SHA-1: a67829be1d4f45e9efa3615c7e9190bceba85345 SHA-256: a3f29aef55fe5b9746f74803614f8f64ef6edcbc883c9c26402fe551c7fc3778
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=solving+equations+worksheet+pdf In PDF document text
    • http://naturfresh.fun/sasekatojederovijibuhwhuc.pdfIn PDF document text
    • https://cdn.sqhk.co/turanexode/ligjeia/94936029968.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/jheife4/ligaturanid.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/fghUGgj/mojegaki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494673/normal_5ff8fb4c6f06f.pdfIn PDF document text
    • https://cdn.sqhk.co/lexikegije/gzSg1ic/fizasizejomovigomal.pdfIn PDF document text
    • https://cdn.sqhk.co/gogoturowib/jhhiiaI/shipwreck_cove_spray_park_2020.pdfIn PDF document text
    • http://carishr.com/fukiradakudapucukbm.pdfIn PDF document text
    • https://cdn.sqhk.co/luwukamuku/idifUhi/superheated_steam_calculator_online.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/hyWjjMf/35282933622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404987/normal_603c60756ffcf.pdfIn PDF document text
    • https://cdn.sqhk.co/kokuxisa/hfaishb/ball_breaking_bricks_game_free_download.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/84435201311zp6bq.pdfIn PDF document text
    • http://contentmedialiteracy.com/lol_worlds_pick_em_guidejeis2.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/emibeNL/fall_race_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/2haVYH0/danitametariwe.pdfIn PDF document text
    • https://cdn.sqhk.co/toxodimina/c3bhft7/minecraft_zombie_apocalypse_mini_game.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/3cUWudz/pressure_washer_attachment_for_garden_hose_canada.pdfIn PDF document text
    • http://arnautmebel.ru/65087591310yz6pm.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/bd94ad81-9867-4ed2-b95e-0f6b28396db7/shark_navigator_dlx_nv71_filter_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/436eef43-59be-48d6-b154-5e670abf9d66/27330800683.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_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 5748 bytes
SHA-256: acd220e06d07f2518d2083cead5a134c1dffe348f5e7bd05e792bf8d1001c47c
font_01_sfnt_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 10476 bytes
SHA-256: 37c9960c3aa82f8cc68bc4f3ab99b033737a5886a50ed8c1eddbfa0c236cef3e

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