Malicious PDF — malware analysis report

Static analysis result for SHA-256 78458c83836184dc…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 09:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4d62b3a2b36cdc03841bff2e68ab2faf SHA-1: 1bece2a4745c231286f4c5150c3ade881f0edadd SHA-256: 78458c83836184dce0e94020ea0b8eabb0bcea74c866255bd627f179b4efc416
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of 'utm_term' in one URL suggests tracking or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://coretry.ru/uplcv?utm_term=android+scheduling+app PDF link annotation
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/61515947178.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/20217065097.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/jamutuwefu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372c4f13746---42498259865.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/44293885978.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/dagixozuguretibuda.pdfIn PDF document text
    • http://jfe.hk/userfiles/12686324582.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/zadabap.pdfIn PDF document text
    • http://arablift.net/userfiles/file/jigurizexepigexojixom.pdfIn PDF document text
    • http://pactolous.hu/upload/file/43316886263.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5bl52ssgaal998dfdpmr4el8k1/xodipasolotej.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/janorulagimidener.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/73927111400.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/88456370236.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/50602628291.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/37259080636.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/nukunobitebeluzasamaworub.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/10600881755.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/dupak.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/sepopefugafaxogimiveremu.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/bizofilolefogo.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/gusene.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091818043756.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/zejumepiwotojikuduvalu.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/sukolabimuxusodenef.pdfIn PDF document text
    • https://asken.as/bilder/file/503731960.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_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 17288 bytes
SHA-256: 4f943dcab7be1354426abb184080454df24af4ad53116c7ee3253b40f876ab2e
font_02_sfnt_off00012737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12737 10776 bytes
SHA-256: ca04d4d444d89720d0f8c5296d09206b87cb0d0e93da6564e59cf13e13480735

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