Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cd3a451ad1669f…

MALICIOUS

PDF

67.2 KB Created: 2021-04-06 00:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a481db8050b2776efae8b0ddd429a613 SHA-1: 79eb87ecac1d3392aad923b920d3914ed8797ebc SHA-256: b1cd3a451ad1669f7bcaf2345e310152025f13c42dbbf297a832d791ae5b7db5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URLs disguised as a user manual. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs likely lead to phishing sites or further malware downloads, suggesting a multi-stage attack. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://kuzutuzo.ru/wix?keyword=alcatel-lucent+ip+touch+4038+user+manual PDF link annotation
    • https://lugumeduzox.weebly.com/uploads/1/3/0/7/130740149/dakez.pdfIn PDF document text
    • http://show-visitor.xyz/5306990851205227.pdfIn PDF document text
    • https://jibabarudemafe.weebly.com/uploads/1/3/4/7/134748102/590324.pdfIn PDF document text
    • https://zaxavafu.weebly.com/uploads/1/3/4/3/134323176/68f411f8c4cb.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/iiK9gfL/26674505730.pdfIn PDF document text
    • http://keysecret.ru/mike_myers_book_canadag8i4m.pdfIn PDF document text
    • https://lodetisider.weebly.com/uploads/1/3/4/7/134732723/6186918.pdfIn PDF document text
    • https://duvefotod.weebly.com/uploads/1/3/1/3/131380754/lotusonugimekavese.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/8NqVgcA/dungeon_heroes_3d_rpg_monthly_card.pdfIn PDF document text
    • https://mikovenib.weebly.com/uploads/1/3/0/8/130813447/5344895.pdfIn PDF document text
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/ladotixubopeluvudut.pdfIn PDF document text
    • https://garovinarabibaf.weebly.com/uploads/1/3/5/2/135293384/zukeseruwosud_newabisiwo_nezukujenetiju.pdfIn PDF document text
    • https://rapokivagifo.weebly.com/uploads/1/3/4/3/134338569/wixupivepivolo.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/gflaif2/hideaway_pizza_menu.pdfIn PDF document text
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/482368.pdfIn PDF document text
    • http://udilische.club/zokixomel8yug.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/1304921.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/faa90d96-ccdb-4a01-bfe0-c639d651511a/what_is_five_fold_ministry_of_the_church.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/001bce42-3cac-4d50-9331-3ac905181d2f/mi_planta_de_naranja_lima_en_ingles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b72218-d4b3-49bc-891f-d835a10e3472/are_navy_seals_or_green_berets_better.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_off0000c607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC607 5780 bytes
SHA-256: 98e2b8a7a1a21193b054ef523857e9331754b68ba54f0c41d44ec562a35508ec
font_01_sfnt_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 10516 bytes
SHA-256: 618d91f401b273e52a831d42f24313b743f0e8ce093aa986737fbba9681a2ec8

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