Malicious PDF — malware analysis report

Static analysis result for SHA-256 b562fbe0388f3cd0…

MALICIOUS

PDF

79.3 KB Created: 2021-04-08 22:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f35843d4f8a9d7b925a2ba9888991d4e SHA-1: 74ddc8e58f390fd06e071ea85e4584f77500a6d4 SHA-256: b562fbe0388f3cd0be0b807fed1a5b605f21cd36940c578db360913625ae13df
194 Risk Score

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/strik?utm_term=logitech+wave+keyboard+k350+manual PDF link annotation
    • http://com-signto2.xyz/36663206980r6202.pdfIn PDF document text
    • http://e-sparks.ru/jelim2v5aq.pdfIn PDF document text
    • http://sweetygirl.club/lego_marvel_superhero_coloring_pagesjwxpw.pdfIn PDF document text
    • http://salearea.pro/308243888546ulz2.pdfIn PDF document text
    • http://presente-top.store/rofigavobasefodiximkca1m.pdfIn PDF document text
    • http://lnstagramsecurity.net/fupidamaxedobusavivotesanb4ysq.pdfIn PDF document text
    • http://cosmosqrab.online/dafowobolazegisesaperozud1g8g7.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/73b03308-172b-4db8-955e-6cdd61b4e2c4/prayer_of_jabez_book_sales.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/bike_stunt_racing_game_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd1aa683-cb8a-4e71-b6ce-002580318204/samsung_top_loader_washing_machine_tub_clean.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/delos_mykonos_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e0fd1c-5406-4f84-ad34-b9d577b6140a/fopejilowoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/606a3cd4-4c66-4c82-91e8-00c9b1477e73/bujedexupinozazojufuno.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_937cd6b0be80418d9bb90bc89c38dde8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/004ae1f9-8ffc-44d5-a0d2-2f7034664bdb/21942981321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ed86664-b627-4cb7-8e65-9a0a1c9f9697/33882271710.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/dark_souls_3_build_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d548dc-ef03-4311-8fa1-8d4e0100e179/super_mario_galaxy_piano_sheet_music.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_0e13fec46b6b4a528cf61b2f8957a448.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b73fe04-d353-4120-a20e-b6776c95f161/33256161920.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/brothers_in_arms_3_apk_data_revdl.pdfIn PDF document text
    • https://3211d54f-29bc-45c2-8691-939fa64f7450.filesusr.com/ugd/2e34c2_2cb37aa9744046d0b97aa22ed69ad554.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_911b4c0af23e428bacfa99ff525b24f6.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_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 6004 bytes
SHA-256: 149a8db6c24c682d76d867549c6ec03eeef39fe39cd6041063e07792b21114b8
font_01_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 11672 bytes
SHA-256: 8186f6046f0c475c8ee8c56b7b424fc4e47d6962edf28fadb3c13fdcdc661f01