Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4965bc9aa0a8606…

MALICIOUS

PDF

70.2 KB Created: 2021-09-15 10:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d0c856c7f378e0a1446e1279f214fc67 SHA-1: 367277bde2eb5f389c3378d66e4cac62a997ce7d SHA-256: f4965bc9aa0a86066fc6a60822ec6950042e8e233d907316a0e8949feb5bc90c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are identified as part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • 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 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://smidgel.ru/uplcv?utm_term=can+you+play+ps+now+on+android PDF link annotation
    • https://by-express.com/upfiles/editor/files/16010025898.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/23126033699.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/nepajuwo.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/66016758184.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/2389191261.pdfIn PDF document text
    • http://chapelguild.com/images/usr/piredamitezafiwi.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/60794157761.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/60741149807.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/32489402116.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/bowogadameke.pdfIn PDF document text
    • http://vecsecity.info/editor_up/fakonike.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/janezivinowutuworetos.pdfIn PDF document text
    • https://razredna-nastava.net/files/wuramuwanot.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/vatoligetewitilefasojoweg.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109050112203252.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e93a98f974---bavosabilazategijowuj.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/96670628978.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/rizojub.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/37372792381.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/89537885765.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/5611874023.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/voxamorasukexepazotunopu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141145738764---boxepemugosatuju.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/703416934.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/sakufitokoz.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/9182166132.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA86 15948 bytes
SHA-256: 8a464e8a7443d93f84c9d08928e6ae14481b068f7f3e172376283909e69e3331
font_02_sfnt_off0000f32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 10484 bytes
SHA-256: 524394e708bca4ecb953716341f49a875f21a9f85b72bd164a103d40936e427a