Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d704da37d6cd6eb…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 16:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ec6ee8eeff0f115a8facdff96b116d65 SHA-1: c33a30337bbd17c27a9601e96336ae114c38b21d SHA-256: 8d704da37d6cd6eb0a5c6edb5e2152b462e26174ffa2e3775ce6bd8d5c708398
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://crewmak.ru/uplcv?utm_term=tmnt+brothers+unite PDF link annotation
    • http://mannadey.in/FCKeditor/file/wusomuxezoxotunewi.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/vetos.pdfIn PDF document text
    • https://aksusu.com/upload/files/fudirilelagigavilip.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/15184588221.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/8420440359.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/golaboreximadasa.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/zozanefitaxipenabarazu.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/poxunasirokemipobilitak.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/kazutodixi.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/99031015042.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/61400442840.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/rabukekenunuperegoregit.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/6122108208.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/parurazawebega.pdfIn PDF document text
    • http://gardatrans.com/content/Files/kevisumigetum.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/mabojifajodasewup.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/zakixumobedejuweka.pdfIn PDF document text
    • https://rintrans.com/files/20318376159.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/51106609774.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/80940443765.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/wuwawemoxibekatejev.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/69550357237.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/fuvozajavelofukuxipapawil.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210903162930.pdfIn PDF document text
    • http://wmsone.com/eimages/file/pofavogemu.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/55876999574.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/2003854802.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92F 19756 bytes
SHA-256: b121e6efc1ef01fdc3bb447bebe2c2432be8095f95911f9b378e8b43a0840ec2
font_01_sfnt_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A1 10368 bytes
SHA-256: 61efdbeca6c1aadf7f3dca4a7371635a8dadff4631eb29dea2abfdacbe1b9140
font_03_sfnt_off000129d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D5 16264 bytes
SHA-256: 862140d1f8d8ae26c225e9154efa4888464ca933dc923735c660f97bbb3f9c01