Malicious PDF — malware analysis report

Static analysis result for SHA-256 78dec7eb55c28761…

MALICIOUS

PDF

79.2 KB Created: 2021-09-10 14:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e92a7444a19db69f0f74ec6e719fc23a SHA-1: b4e239f10e7ffdb7f7531884a3576aceb922f158 SHA-256: 78dec7eb55c28761b52d202cfa7ba3d17d38cb4a53c56b49dc741f8c17888ffc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://drafthe.ru/uplcv?utm_term=how+to+connect+android+to+pc+with+bluetooth PDF link annotation
    • https://iuoshili.com/upload/users/files/daraz.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/29055983298.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/fikukisitimumaxebovis.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/bozetitidef.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/nawofelutabojukewo.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/gebinemiwopubotopojuf.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/nowepoxa.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/28290896480.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/wubosuxaterigidovomojefax.pdfIn PDF document text
    • https://bawauang.com/contents/files/lizelowanozojovurepoxegop.pdfIn PDF document text
    • https://bachson.net/upload/file/49755224917.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/zeduf.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/nroupb4q810c2jurc6b37k7b00/sugebadebifupibo.pdfIn PDF document text
    • https://aildf.in/userfiles/file/44504299676.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210905225234515893es4mgp.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/16279319849.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f55c628b0---88125973412.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/40166338476.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/16125898217.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/xililukaxapatise.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/nunevesodosife.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/voteguzimiv.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/96385954027.pdfIn PDF document text
    • https://wecareprogram.org/images/file/41025422694.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/35795173046.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_off0000d24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24A 16976 bytes
SHA-256: b8bad1908f52cdcdfa8061d3caeb9cc1629fb110279b4a34c6b892728df7c3fe
font_01_sfnt_off0000fe3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 10760 bytes
SHA-256: 3692fbb179cda4a855ebd40fcbcbb791cf4919d46efec4c9fb390d7d3b78cb06
font_02_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1