Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c3fe2aa3bd7698…

MALICIOUS

PDF

75.0 KB Created: 2021-09-11 02:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7af32852e7a2ba82d3378e4240f1e9c SHA-1: 2b0612ba778a2f76414e5aa700bdd792013d8720 SHA-256: 78c3fe2aa3bd769860f0084113f276ad0efa1c2f444779c78bd6f918f3ff44da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, despite some being marked benign, point to a pattern of redirecting users to potentially harmful sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://safiorida.nl/operatori/userfiles/file/2538346710.pdf In PDF document text
    • http://trumoi-khutrung.com/upload/files/losaw.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/wopub.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210906080027.pdfIn PDF document text
    • http://ifap.it/images/file/lowigogiraveka.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/6591856715.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/pasapuziwevijowunozosotu.pdfIn PDF document text
    • https://termoformat.md/img/files/kigibon.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/43303877602.pdfIn PDF document text
    • http://klpa.net/userData/board/file/69710861643.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/42582969755.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/94430067507.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/59353288575.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/fojevesepuxul.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/93128130597.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eb3904d93---puzuweja.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/11862803686.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/punodunip.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/kemoj.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/30215007941.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/89533022148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=funny+bingo+number+namesPDF 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_off0000bf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 17944 bytes
SHA-256: a5c5d6b12b89c1d9016936b1124b586fee7bf996bcba19f29b821a7b612edd70
font_02_sfnt_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 10636 bytes
SHA-256: 95de63f6320cdb09399f25e6d6d71bb453d6217af85be8a525beb85b6d2ca321

Open this report in the interactive analyzer, or submit your own file for analysis.