Malicious PDF — malware analysis report

Static analysis result for SHA-256 136b88234f3453fe…

MALICIOUS

PDF

76.7 KB Created: 2021-09-27 01:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 634981cd906b023ff48f122a862dd32d SHA-1: 46943b60a9caff6d732729bc9deaa113cf824106 SHA-256: 136b88234f3453fec93a16636fbc7cbc2a458faa757b092fef4c6becddca93a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains a high number of embedded URLs pointing to various domains, with a heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://xn--krmer-dnnebacke-1kb72b.de/files/file/74830464608.pdf
    • https://vicotelecom.vn/static/source/images/file/ramoximalasijak.pdf
    • http://wcsps.com.tw/ckfinder/userfiles/files/lidumivexurupaziwevojal.pdf
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/dexodabokapexala.pdf
    • http://www.rupankar.com/fckimages/file/16321289594.pdf
    • https://salwangurugram.com/files/1535429254.pdf
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/fererogigusiguzu.pdf
    • http://bmfjhjk.friend-match.com/upload/files/refefumipajipabonogabufu.pdf
    • http://jaluzipro.ru/public/userfiles/file/fojeruzoloruxabov.pdf
    • http://vertex-decor.com/userfiles/file/10359944192.pdf
    • http://agecarekorea.com/ckupload/files/lebomumizovut.pdf
    • http://jungam21.com/upfiles/file/1632321471.pdf
    • https://areicon.com/images/file/kejuwopagavirobasu.pdf
    • http://nhagiatxanh.com/public/default/ckeditor/files/mezefewez.pdf
    • http://guss-ex.de/uploads/fck/file/zudamuvurot.pdf
    • http://lnimeina.it/userfiles/files/bupefapepituganilirezi.pdf
    • http://camel-republic.com/media/userfiles/files/82595849532.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/f5ae6d3401f49c4c9130aa885460c4f3/judemotaditiwoki.pdf
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/nogujajupa.pdf
    • http://sm.ac.th/ckfinder/userfiles/files/3288352572.pdf
    • http://opersan.com/file/95747805472.pdf
    • http://www.egavilanes.com/ckfinder/userfiles/files/56463797395.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=westminster+confession+of+faith+with+scripture+proofs+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_off0000c0ea.bin
68fa3aa1194737119b9685cd9bc0994ee97d2935750bf1a9ec7002f8f05d4b8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EA 18860 bytes
font_01_sfnt_off0000f294.bin
d66744a2c3896ffbed166a6d23634797eb7ad2b300a155e98a5bb87fe1be307c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF294 11016 bytes
font_02_sfnt_off00010c0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 16792 bytes