Malicious PDF — malware analysis report

Static analysis result for SHA-256 df157b76a54af647…

MALICIOUS

PDF

78.8 KB Created: 2021-09-13 10:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0047e07a42fe255686c14f0c0d3edabb SHA-1: 944863b2724a46ee5033340d06653e6ee5ae0d29 SHA-256: df157b76a54af64701ebf6cddff3ef7024c671b60cccd10125eba6abb443b2c6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pistant.ru/uplcv?utm_term=coc+th9+best+army
    • http://anvlaw.com/userfiles/file/45120965823.pdf
    • http://metzlerranch.com/userimages/nujafotijejudezezigutuviz.pdf
    • http://oa30us.com/userfiles/file/48968581334.pdf
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/93136779666.pdf
    • https://alarrabnews.com/images/content/content/file/6719084611.pdf
    • http://thaifilmind.com/UserFiles/file/66741347607.pdf
    • http://ingmontagna.com/userfiles/files/vujukifalukirosudozoda.pdf
    • http://pololanna.com/user_img/files/52156111784.pdf
    • https://kingdom.vn/userfiles/file/fusepapizokujuzogozifur.pdf
    • https://mountmoriahcamp.com/media/1811130891.pdf
    • http://elazentrale.de/images/uploaded/file/65246976158.pdf
    • http://myredm.ru/uploads/file/42203825315.pdf
    • http://designpavelzapletal.cz/files/file/73052966182.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613559cccf84f---medopiguxigazigapijeva.pdf
    • https://abrasco.org.br/ckfinder/userfiles/files/gezokuzexaluvuletijid.pdf
    • http://igigeothermal.jp/userfiles/file/39163689924.pdf
    • http://rothemtour.com/FileData/ckfinder/files/20210906_D3321906F1CE8B87.pdf
    • http://gesundezellen.de/neu/userfiles/file/6792491188.pdf
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/gobine.pdf
    • http://nikolabartakova.cz/files/file/nugogemu.pdf
    • http://bjjiffy.com/upload/81409736267.pdf
    • http://vinacafe-dalat.com/Images_upload/files/7191806054.pdf
    • http://nakamurasangyou.jp/app/webroot/uploads/files/juseravorebaludujetoso.pdf
    • http://driver-jazda.pl/upload/file/28076901268.pdf
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/61755895809.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/35028575088.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d027.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD027 16792 bytes
font_01_sfnt_off0000e839.bin
9c32ae151eb545433222cc6249a7efabcbfc56f9b31a243643cb79b82f493cdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 17328 bytes
font_02_sfnt_off000114c7.bin
27c51be0e25c98b4f15aa96cab8f765e7adc1b826a3c30816ed3854c2d184f7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 10704 bytes

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