Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd9afbeb4da3bd1…

MALICIOUS

PDF

79.6 KB Created: 2021-03-14 21:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b93415b0e8a9cf87a7738fe2b9e9afe6 SHA-1: 98b633bd425db44396c6a4eef51d419eb9befed8 SHA-256: 4bd9afbeb4da3bd1a8c3158197e5aa81b80d1be8c026a5b80b29cf0459865cd0
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 0.9996

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://jumiwimov.ru/award?keyword=hitachi+arietta+850+pdf PDF link annotation
    • https://cdn.sqhk.co/mizipudi/jgicje5/56804716329.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/YzjgpbT/amazon_prime_video_app_for_smart_tv_download.pdfIn PDF document text
    • http://madawuboso.sportsontheweb.net/klb_chemistry_book_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5ff0c46d393f3.pdfIn PDF document text
    • https://cdn.sqhk.co/bewiviki/g92je5a/marsha_blackburn_family_photos.pdfIn PDF document text
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/miraburaz-popul-bezew-wavive.pdfIn PDF document text
    • http://bulubuzigajuzar.getenjoyment.net/jci_accreditation_standards_6th_edition.pdfIn PDF document text
    • https://furikokazi.weebly.com/uploads/1/3/5/3/135399827/ab717ee425805.pdfIn PDF document text
    • http://witexodegimo.iblogger.org/wowutajebiwuzoriwajuf.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/roadmaster_vintage_bicycle_serial_number.pdfIn PDF document text
    • http://joxorapux.22web.org/rrb_cbt_admit_card_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454161/normal_6045e339d1fef.pdfIn PDF document text
    • https://cdn.sqhk.co/sazipuvaxiv/iPiiUk0/rorowojiguvejogamefum.pdfIn PDF document text
    • https://pagipakudux.weebly.com/uploads/1/3/5/3/135343553/vivumujixoniwu.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/how_to_put_graco_stroller_back_together.pdfIn PDF document text
    • https://cdn.sqhk.co/zopizote/tsjaigF/water_park_fun_water_slides_in_london.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/647b515d-36f1-4805-952d-cc11e0f5c104/mechanics_of_materials_5th_edition_beer_solutions_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7355684-8db5-4586-876c-20493475f08d/pogagipefawetim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d107be-b8fd-476c-a017-11f0f8b1f2ce/flaxseed_meal_recipes_cookies.pdfIn PDF document text
    • http://puribisipup.atwebpages.com/tivojol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79bf4664-ca57-4e2f-864a-d64c68cf2664/best_covered_call_option_strategy.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_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 5456 bytes
SHA-256: 2b50d9660e0512218718311a2ad9b07064a84a3ee9e96014342a76077267dcf3
font_01_sfnt_off00010c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C92 10612 bytes
SHA-256: a62a5b2ac892aee55871432beeea296ec2b0d3fbc6df9f2ea40cf4011a252e4c

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