Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4de5127ab5e91f…

MALICIOUS

PDF

83.0 KB Created: 2021-04-01 11:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c00a22708a103277a4ab3f571ac66282 SHA-1: 5485c514094dce857741e912f640f88bbddd0d78 SHA-256: 4f4de5127ab5e91f6940477c2ddb393847ef94daaf1a931ed15281331e4889a4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/123?utm_term=dragon+slayer+2+osrs+guide PDF link annotation
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/1339821.pdfIn PDF document text
    • https://cdn.sqhk.co/vofosutuwo/jaibCjd/35069070432.pdfIn PDF document text
    • https://xikoxuzit.weebly.com/uploads/1/3/4/6/134632277/9193735.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/eIF1ifZ/real_car_race_game_3d_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebosatu/iagfTDB/thrones_kingdom_of_humans_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/gj3hEig/97690702598.pdfIn PDF document text
    • https://majivuwuwu.weebly.com/uploads/1/3/2/6/132683475/luxajikuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/gdaicig/a4_sheet_size_in_inches.pdfIn PDF document text
    • https://vexojuvij.weebly.com/uploads/1/3/4/3/134345090/3514899.pdfIn PDF document text
    • https://cdn.sqhk.co/dufolatik/jdjhbgf/55692637751.pdfIn PDF document text
    • http://vetovikaxu.mypressonline.com/50723851855.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/dgcSheY/punisher_skull_wallpaper_4k.pdfIn PDF document text
    • https://cdn.sqhk.co/sapidefapo/7nJbaZj/speed_night_2_game_download.pdfIn PDF document text
    • https://jositaloj.weebly.com/uploads/1/3/4/0/134042718/8ca84357f.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/5c6e2643-a653-421c-8b1f-1bc409775ffe/nfl_schedule_2015_week_7_predictions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c147353-f466-4d8c-ab3e-91420498a96b/ruravovokalawifujulafomu.pdfIn PDF document text
    • http://zevesijuduma.atwebpages.com/71128998182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87edd624-7dcf-449c-a61e-c6bd584f57f1/first_classical_piano_pieces_to_learn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91acf2ea-df25-4bd4-a6b5-4ec9bcbab836/compare_black_and_decker_workmates.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 5228 bytes
SHA-256: fa17f19ce72bb843ef1b715f0204b16cdccfaeb191d936e1f00fe9365b247ef2
font_01_sfnt_off00011966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11966 11016 bytes
SHA-256: ab7d6f06241a30ed4cb6793588bd7a9946c5b64516ffb6a03aefdef88c9da3bc

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