Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c28ee35b0f0354e…

MALICIOUS

PDF

77.5 KB Created: 2021-09-14 12:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85b0f7574027f22c4d2feae563625968 SHA-1: 797c4842868105285ee50a73846146a6fe8b3087 SHA-256: 3c28ee35b0f0354e9708a0a8df97d6c2f608b7dabbc1c5e38a02172f6f7d9030
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm directing users to numerous external URLs. The presence of external URIs and the 'disposable hosting' heuristic strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF format often utilizes embedded JavaScript for malicious actions, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://nomylo.ru/uplcv?utm_term=brothers+in+blood+the+lions+of+sabi+sand+watch+online PDF link annotation
    • http://carzip.biz/files/uploads/files/pumalorusoxejenememur.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/videmidoxesemevomalewatad.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/vulufazususimixoxep.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/nunibipegukex.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/35805610226.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/ponukut.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/budunuzamelifazuti.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/geporupulenuvus.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd43dfe41---44198653629.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/leremadudebefavufolaw.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/zugofimalakereniduzoxoke.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/82317131945.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/susolu.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/uk884lgqsvc3gcl1tusvm54r6n/46701894971.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/98871405192.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/7318921319.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/nagosixazosikuromufokuku.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210904_173816.pdfIn PDF document text
    • http://dongphat.net/upload/files/letedomekuwebed.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/97963920568.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/xitabulidizomowukero.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/83835346673.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/wowikikigijikexesuzogen.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/vezidisixowavevowez.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/jirutovafobe.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/kumewawufemanolu.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/2568150782.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_off0000c988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC988 17244 bytes
SHA-256: 3451546082959acf65188febeba3be3218f5abb7c2fb4990b216e4708b5099f5
font_01_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 10852 bytes
SHA-256: 17c0956d2f361560b7804e4c4c7c90b412ee13496a5f311b2d17267572983137
font_02_sfnt_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1