Malicious PDF — malware analysis report

Static analysis result for SHA-256 07ac4c5a49b1592b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 10:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 14cae75ebe52f2c53dcc47900d91b47c SHA-1: a3595b8cbd70f9bf6409a7177333a93ceb610fee SHA-256: 07ac4c5a49b1592bd944a975d7fce2dc6cb51ff3c73f9e96e67012ca22dbafd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, despite one being confirmed benign, point to a pattern of redirecting users to potentially harmful sites. The primary attack pattern involves tricking users into clicking links within the document, which is consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://tischlerei-schlusche.de/sites/default/files/file/71518077251.pdf In PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400eb047948---podenamoguk.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/begorimoniparukuwumir.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/4968088791.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/rigebukew.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/20239964021.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/4385507353.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/96362183072.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/58689424570.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/nosekaxomuzexosipa.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/jovemex.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/medusugesofibit.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/zowalumageduxofelikubu.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/mubaneropesujaturami.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/s0h1h3iot6f29a6b3i6jl0jk9c/vomuxamuwogum.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/85824090378.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/36584874154.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/21198468998.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/66120437909.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/zabaxexutokitez.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/87525703049.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/duguveboxovuruduto.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/7231929236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=online+games+with+friends+on+phonePDF 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_off0000b2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DC 16536 bytes
SHA-256: 67532659573bb015b91eb0df590474158104a333ceeb33f27ac051a09aa1a6f9
font_01_sfnt_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 11056 bytes
SHA-256: 93578f725ee8d95fcfb8ad68f8fc4c18787d131084eea761f4bc026074d74c7c
font_02_sfnt_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1