Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d759ad47dc67f1e…

MALICIOUS

PDF

76.3 KB Created: 2021-03-16 15:29:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 412095d7c8fa8efd92cd1dc283845504 SHA-1: a1461e14c69fb0772f65733d2366cffd45f0a5fc SHA-256: 7d759ad47dc67f1e68d903c7cf4ce8edf84cfd90252a193a3dc76720adce0901
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://xajibur.ru/award?keyword=dream+dictionary+book+pdf PDF link annotation
    • https://cdn.sqhk.co/rugofufol/1PgdiaV/free_download_game_stick_war_2_order_empire.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/micjifz/top_50_soccer_leagues_in_the_world_2019.pdfIn PDF document text
    • http://dazomasuw.22web.org/youngblood_band_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/hhczQOf/my_boo_app_change_name.pdfIn PDF document text
    • https://cdn.sqhk.co/nemalerute/cicjjjj/9489147458.pdfIn PDF document text
    • https://cdn.sqhk.co/tezikegoj/FhbVygf/50007237936.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/f9lkjih/rugevuxobom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413223/normal_5ff8d3aa670c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367302/normal_5ff716879424f.pdfIn PDF document text
    • https://cdn.sqhk.co/kipasewimoni/bVhbpgf/kodonuzawajekakeresafe.pdfIn PDF document text
    • https://cdn.sqhk.co/nizaveni/cifiagc/duracell_9_volt_battery_datasheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/mitosis_and_meiosis_in_plant_cell.pdfIn PDF document text
    • http://fidomibudirej.rf.gd/bookshelf_door_minecraft_ps4.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_d59a42b4102d43899e4513d691372ca8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/love_story_whatsapp_status_video_free.pdfIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_d25e2919e66046e7a034a20269b6422c.pdf?index=trueIn PDF document text
    • http://mofuvuziwoloj.epizy.com/cirque_du_freak_manga_series.pdfIn PDF document text
    • http://jutenolare.rf.gd/navien_combi_prices.pdfIn PDF document text
    • http://zafitubebetero.rf.gd/break_even_point_accounting.pdfIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_56d16276f37d4ba9b70f27efc6ac5683.pdf?index=trueIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_ee8c52288eba449fb8b4b49426750eac.pdf?index=trueIn 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_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 5396 bytes
SHA-256: 9d8c28d38626fc42bcce6d6ad178dec6216862a8cdcd1a9fc5249990a9bbaa5c
font_01_sfnt_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 11064 bytes
SHA-256: 8b268b0028b953ce5a6885d17d9a2126606e5beedcee4944645b2783955f49ad