Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f13603d0f57aaa…

MALICIOUS

PDF

67.9 KB Created: 2021-09-09 22:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f22dbc8de41f31b6cdcdaae4f0affb53 SHA-1: 37bc4e328b50c838385ca33ec0e6ab0604be37d0 SHA-256: c5f13603d0f57aaaed61bd3464af9d03d69c6f3c2aadd2415a294a76fdb52405
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and multiple external URIs, including one pointing to 'garglob.ru', suggests the PDF is designed to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the PDF is part of a link farm, likely for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=coc+magic+2021 PDF link annotation
    • http://www.ondebiz.com/userfiles/file/ratofijopijavajaxotijatej.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/44064486066.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/wiwuvumivobeg.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/lavilamokezufasotoxesejun.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/79976338713.pdfIn PDF document text
    • http://rapet.hu/files/jorozusezajenuwugivuso.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/kuguvir.pdfIn PDF document text
    • http://abc-tel.ru/data/File/25980084617.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/32007168879.pdfIn PDF document text
    • http://pactolous.hu/upload/file/zafunefavanosipi.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/wibomajapirixasaleso.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/49101492605.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/bazezemijasukurifodanut.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/16642477467.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/52011897309.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd8a77a01---64752579333.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210902_7D177C7A0F7DB79F.pdfIn PDF document text
    • http://jfe.hk/userfiles/19871794855.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/lojinixerarifili.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/86939553064.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_off0000af99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF99 14540 bytes
SHA-256: 080ac804cd9d90850609e526098d9a76f3f1601d09d88e5b4680a26904df1229
font_01_sfnt_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 10252 bytes
SHA-256: 22a0f18f2d07a6403502854417a73b781ff5f2f650bccf719c0a5e110dcafc6c
font_02_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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