Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c091f2885840ee…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 18:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f4a21a84f715f9a3adf8fe82c35d51a7 SHA-1: b8427dbd0375e09c1540053dfc5bc371e10a928f SHA-256: f3c091f2885840ee14392f49972c8b2c5e74f204097f21621e3ab34cf5473857
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=vidmate+apk+download+for+ios PDF link annotation
    • http://uzks.hr/upload/datoteke/fofakimoluginutolilamame.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/33916190527.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/wunufu.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/wirep.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/68349507042.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/vebototix.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/kepopelujedawupajakexa.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/kepopedetajore.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/xekumatunoxulitutumixabi.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///purazolanejeme.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021912128589555.pdfIn PDF document text
    • http://aprt1day.ru/file/zisibuwibabiruxufuzu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613005c7e3fef---kesikowisatewed.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/2752539024.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/40348123230.pdfIn PDF document text
    • http://vit-physio.de/file/24088903841.pdfIn PDF document text
    • http://aurora-c.jp/files/files/3360142885.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/63eq069sjmi1iakfm5pt0cps7v/18663279239.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/28266510315.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/sefalubetevusumoxorodumu.pdfIn PDF document text
    • http://woykoff.hu/upload/file/91132084109.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/16601062749.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/7850657425.pdfIn PDF document text
    • https://oferta.lt/i/File/salow.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_off0000b09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09C 16524 bytes
SHA-256: 8cf8afa5b30d0f680d02df6df48732da91b77f76156c7bb85e1ea4305095fb2f
font_01_sfnt_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 10808 bytes
SHA-256: f66391fa58c4e0c80288082d3735e11a7d5540a62af634020788fb872b4e7304