Malicious PDF — malware analysis report

Static analysis result for SHA-256 70dbd2fbacfc87f9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 15:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4472a03630c624301ad7656ddb6c13f SHA-1: 49a9852955dadad3594a9468d82c4fe4502c1d9e SHA-256: 70dbd2fbacfc87f981c5ba9f9c31a8d0d0f9544521e50c9f016919823e6a2768
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or are part of a link farm, indicating a strong intent to redirect users to potentially harmful sites. The PDF structure and embedded content suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=summer+of+85+movie+online PDF link annotation
    • http://huseyindurmuslar.com/images_upload/files/dukagaba.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/jenebave.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/girixujet.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/vadojimazofelixolojuruk.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/5418731155.pdfIn PDF document text
    • http://tdbm.vn/upload/files/79432747395.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/58767955296.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161391f4c5fcff---16134825990.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/24693752371.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/20446656660.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/4288887082.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/26071012396.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090512090973499.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/20698606033.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/21964872807.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/76912799576.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/27158451814.pdfIn PDF document text
    • http://www.og2c.com/images/file/diremuropoganu.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130db69da450---93502845282.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82585714607.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/64523312332.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/78151417394.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/tagogiwosilibip.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/77144822944.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/55138924251.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_off0000db1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1C 18072 bytes
SHA-256: d053828b0f495766d261a4dd0e8c30ecaf69c30908b93f7bf60d58b7eb9325cd
font_01_sfnt_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 10528 bytes
SHA-256: b6663caab203c7e0f66e0f5893df65c4f2a13badae96599904b9f7d87539afa2