Malicious PDF — malware analysis report

Static analysis result for SHA-256 869101c6fb32f0f3…

MALICIOUS

PDF

77.0 KB Created: 2021-09-19 22:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9046167c2ac91391dfaa975cdf1aec1c SHA-1: 2b711da11f1251ea6430de20ba8568297b20c43b SHA-256: 869101c6fb32f0f334b2cc13a7c7e23e36e2b72fcae9a28ec86fd79678a73078
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_JS heuristic indicates the presence of embedded JavaScript, which is often used to perform malicious actions like redirecting users. The ML classifier and ClamAV detection strongly suggest malicious intent. The numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, further support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=isaimini+tamilrockers+master
    • http://fields-on-earth.com/images/blog/file/kebizalivezibibikixagebu.pdf
    • https://hamayeshniroo.com/shop/file/tuxikoritagezosupibu.pdf
    • http://deepakbatteries.com/uploads/file/3872788391.pdf
    • https://manuscripthandler.com/userfiles/file/36437398541.pdf
    • http://morebricks.com/ckfinder/userfiles/files/fefupewapivakufobaguxo.pdf
    • https://rinducm1.com/contents/files/68770395078.pdf
    • https://phuquiland.com/upload/files/55199847480.pdf
    • http://cpk.by/ckfinder/userfiles/files/poxitotepinirevaben.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/13748029246.pdf
    • https://alariel.be/userfiles/file/61776607345.pdf
    • http://na3.it/misc/file/biburogediwewolexevofi.pdf
    • http://www.parinet.fi/tiedostot/files/pulazogafo.pdf
    • https://markapin.com/calisma2/files/uploads/negojivonijugu.pdf
    • http://nicolalazzarotto.com/userfiles/files/natokirezadevijojamaf.pdf
    • http://thevisionkharj.com/userfiles/files/5141888005.pdf
    • http://hyundainhapkhau.net/upload/files/69373485804.pdf
    • https://novamakine.com/upload/ckfinder/files/13502405357.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2a24321c3---sizegopirumuwor.pdf
    • https://poulinstrapscan.com/userfiles/file/46948318618.pdf
    • http://duhochoangthanh.com/upload/files/jizakupewizi.pdf
    • http://shengnabei.com/uploadfile/file///2021091202293714.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137e2af87969---bikukamuxukigokinuriverob.pdf
    • http://em-mould.com/ckfinder/userfiles/files/fimuzitofaxeseranetebu.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_off0000c922.bin
af1db69946630150ba45ac7020a6d8c07e61410dfb05a16060c0adedaad0243a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 10432 bytes
font_01_sfnt_off0000e0c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 16792 bytes
font_02_sfnt_off0000f8d8.bin
37861f0c37be71729dd19ac82d4309600e608f8d2e067acce60e66108e3f8e85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 17444 bytes

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