Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d91308377cf3bb…

MALICIOUS

PDF

73.4 KB Created: 2021-10-02 22:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 58eadf3ea6b93270023b1fe9d2d5907c SHA-1: 6bd616d6d06b4cae553f2fd831e62b4592575fec SHA-256: 45d91308377cf3bb772881b7f7318b12ea60b31e31e1519f9ecf335ffd75b4b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to distinct, potentially disposable hosts. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://codienlanhtrangia.com/Images_upload/files/xonuxexogufovim.pdf In PDF document text
    • http://elverum-revmatiker.no/images/file/74997165564.pdfIn PDF document text
    • https://jung-yeunjang.ch/userfiles/file/80254247902.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4c0fde472---41858966190.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/mugenulodemadilirarokasa.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/suxusuzubinodis.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/letuvikozejufurewapuza.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/xogowosazajofo.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/fikovikavazunus.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/21017922816.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/20638366972.pdfIn PDF document text
    • http://alltechsro.cz/files/87142652706.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/mugiwebunafezod.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/98540415402.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/xetasodovir.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/86051734639.pdfIn PDF document text
    • http://benly-carson.com/product/files/35725512499.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109200450154299.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/mubegatebojuxusaruna.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/mogosogafepejumupukuxazon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=god+loves+you+and+mePDF 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_off0000b98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98D 10440 bytes
SHA-256: 7e7ca4c9743f6b7c1f34e562b9052ed7926969889f92ebc4ee80922b3764dd18
font_01_sfnt_off0000d145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD145 18772 bytes
SHA-256: 7b5ddc996cebdcd9f0e995e76f5a0e457f0d1e934eb98fa43b2c12fecc028e00
font_02_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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