Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5be756e57ca32e…

MALICIOUS

PDF

72.4 KB Created: 2021-09-14 21:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e515182a4b5b4d7b9f1c44e516ebc33 SHA-1: cb590bfbee41d8c0081f2a72037df307e00da09a SHA-256: 1f5be756e57ca32e17d38d1060bc84cc7268cb3a3fa1c70674694eaec2b56a36
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this pattern as suspicious, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hungthanhauto.com/luutru/files/89409587729.pdf In PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/nixufimedu.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/nifovexewijorumebi.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/ruvagevujojepoko.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/verafubevuwadigo.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/purewevosalulolor.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3104bb30---miwavosijijabuge.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/ridoxulemizotaluwufabu.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/betepofewegeretabu.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/65894662506.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/vomevivazipadixaroliz.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/092313519568.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/sepawimiwoferij.pdfIn PDF document text
    • http://matras-devison.com/upload/file/womuk.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/rinapafikuxirokajikomo.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/maferemowedonoruvat.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d923825cfbf3224133e3cbba5a0f28b7/16727961192.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/watarobekevenub.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/71101873772.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/dibadazavefusenosevamam.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/fakalu.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/79133313563.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///lidatibuvig.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/mubabapofatuxog.pdfIn PDF document text
    • http://carbontuning.ru/file/sovize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=dualshock+3+controller+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_off0000b329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB40 10832 bytes
SHA-256: 211beb99f1afc051e9a0c523736f8dd61c0174e8b64f3eb73d37c430a0eabd1a
font_02_sfnt_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 18812 bytes
SHA-256: 4419a87144820bbd9e1f39f48cefdfc936a2681d325fe02b970bfbdaa499c334

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