Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee350da25c8c36e2…

MALICIOUS

PDF

84.6 KB Created: 2021-04-01 10:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1707f968c490d18d807c059a2265335 SHA-1: 2e2253c13dc0473f3a9ebea889d56188e1464287 SHA-256: ee350da25c8c36e2b754f84a19fbac53e59a63d9d1847c4da7a46709a111ebad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a malicious document, likely intended to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=economic+development+council+of+colorado
    • https://jubojavinuduv.weebly.com/uploads/1/3/4/3/134316702/xoxufitabuki.pdf
    • https://mawafusujomadil.weebly.com/uploads/1/3/5/3/135351104/pafafakiwa.pdf
    • http://poradoit1.site/brother_printer_mfc_295cn_clean_unable_46xo81s.pdf
    • https://vuwisirikufav.weebly.com/uploads/1/3/4/7/134765545/taluwunif.pdf
    • https://vuvonuzomuvi.weebly.com/uploads/1/3/4/5/134508102/8148723.pdf
    • http://tamakar.tech/60521759682v7doq.pdf
    • http://fotonagosuslugi-01.space/flexform_cestone_sofafarhb.pdf
    • https://nutakiderovex.weebly.com/uploads/1/3/4/6/134622867/6cdd28.pdf
    • http://wamawebikojas.22web.org/crossword_app_answers_hummingbird.pdf
    • https://wunogalabapa.weebly.com/uploads/1/3/4/6/134603674/bizedibazo_xezetiwonitej.pdf
    • https://waniwuwaweduf.weebly.com/uploads/1/3/4/3/134348957/363982.pdf
    • http://lupobel.22web.org/23848817702.pdf
    • http://watomidipokaki.22web.org/tex_jpg_eps.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gulapore/83897106614.pdf
    • https://s3.amazonaws.com/fulosobezur/anonymous_browser_apk.pdf
    • http://nigabosepa.epizy.com/holt_algebra_2_california_textbook.pdf
    • http://siwofumev.rf.gd/43132935413.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a4.bin
e62cbd518ad539fbc9c9baaf7ca7921f4d9938f8031b294c2e195f780caa7d64
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 3652 bytes
font_01_sfnt_off00010db4.bin
b1e603469debb26eedbd0b87c20cab685a15f81faf97e99d04f7e25df0e8f80a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 5140 bytes
font_02_sfnt_off00011f2a.bin
7452b081cad0ac8a18b2bd0066ffa41bb177ff051286efdab906fd68d8a1cd58
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 11076 bytes