Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c6d088ce5da431…

MALICIOUS

PDF

70.2 KB Created: 2021-10-03 02:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c00f7ee64cebafd98cab307b33c53468 SHA-1: 3bbebb0d51c61b82c0a527014b96f4e0a2b36163 SHA-256: 65c6d088ce5da431ac7ef720bd9a913511f3444d723ba5100ff6c361eeb8f94c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to use disposable hosting for these links. While no scripts were explicitly extracted, the nature of the PDF and the presence of external links suggest it's intended to lure users into clicking malicious links, potentially leading to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hanomanberjaya.com/contents/files/gijolorerufaxaxaj.pdf
    • https://marathonblainville.com/userfiles/files/fegakapufabuwovowafu.pdf
    • http://rld-carbon.ru/file/pusijifunukub.pdf
    • https://ibrahimkoc.com/images/Media/files/ludaluneniwavixorinodopej.pdf
    • https://leise.ru/admin/ckfinder/userfiles/files/garom.pdf
    • http://kirakuramenandsushi.com/uploads/files/biledakupefadujokago.pdf
    • http://td-mg.ru/uploads/files/13615308343.pdf
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/tadimoxozat.pdf
    • http://aristosaigonhotel.vn/uploads/files/72829904139.pdf
    • http://keyflounge.nl/userfiles/file/63826562989.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/48146825667.pdf
    • http://eortak.com/img/fck_temp/file/sivupekifipitironaw.pdf
    • https://sydneystudytour.com/accounting/userfiles/file/9937050944.pdf
    • https://kettosallampolgarsag.net/imagini_ws/60722691165.pdf
    • http://goodfortune.hk/UpLoadFile/file///9033008026.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/vinegusoxamibuja.pdf
    • http://tecnoservizi.com/userfiles/files/19434530492.pdf
    • http://zeci.nl/im/image/jelebekus.pdf
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/fakupowavigorerefedimu.pdf
    • http://chemicalengineers.ie/images/jokufeborusegawunanepikun.pdf
    • https://systematix.pl/userfiles/file/wazego.pdf
    • http://greenmodels.ru/uploads/files/43477676415.pdf
    • https://paklya.su/design/img/upload/file/1630023474.pdf
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/67993218965.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=history+of+indian+judicial+system+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_off0000afdc.bin
d236d760745463781228b3932cc25d785007dc2cf5b47545f95de58b2409b510		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDC 11116 bytes
font_01_sfnt_off0000c9c3.bin
6c50a49bf2c8581b300f66cde8785541e91df868511c7c6f7d9794d931858167		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C3 16232 bytes
font_02_sfnt_off0000f342.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.