Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fefab34fa555f0…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 00:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b529e468d9dc6accaa9f745a8a7ab1b4 SHA-1: 7fa043aa6ce9ab6d539d4c2fc97993e81386290e SHA-256: 75fefab34fa555f0f78eafe5a75fdcd19a07be3259e550e87044d2c5c6bda6fc
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristically identified links to external resources, with one heuristic specifically flagging it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laps.pl/userfiles/file/bonurigadejogimelenaferul.pdf In PDF document text
    • http://dgjst.com/upfile/file/zawivobupabanu.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/wumapekevizezuminopi.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/42580150207.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/jafidevutofibemol.pdfIn PDF document text
    • https://sergiomauri.com/images/file/sasifubu.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/89282605405.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/kegibipepelil.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/50931516283.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/2975849803.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/65435140856.pdfIn PDF document text
    • http://nktrading.qa/file/files/bivufuzujorimefalo.pdfIn PDF document text
    • http://evola.it/userfiles/files/62197111548.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/65447819542.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/54485789691.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/49835963304.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/43802992276.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/mezimevuluwizefanes.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a66a426ebfd580b855abe74bf2761a08/xovoreduvogigiweku.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/siwevatefimivokagel.pdfIn PDF document text
    • https://atl-50.com/files/file/tezogukupuwipowomovibin.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/60217530598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+mac+address+changer+for+androidPDF link annotation
    • 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_off0000b13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13B 10928 bytes
SHA-256: 267173033cb02fba7a13ffb2841abb6af3db2ec4315a675cbf4ebacb59b52760
font_01_sfnt_off0000ca27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA27 18256 bytes
SHA-256: 6963c575dbf6f99bd27fc02b13cf105fb714a6eb885d1e8073fb37c08c1678fc
font_02_sfnt_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1