Malicious PDF — malware analysis report

Static analysis result for SHA-256 04517cdf349c558c…

MALICIOUS

PDF

79.6 KB Created: 2021-03-18 01:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 867380a25f67ec24b28dcbfdba0f5b23 SHA-1: 8074623f83e7cad18c1cc4a0073eaf4427e5cd27 SHA-256: 04517cdf349c558c558651d1dcbc245f7ffa69b72f8bbe1ca7a6ae8ff47b7aab
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains a significant number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document prompts the user to install a browser extension or update, a common tactic for credential theft or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crophysi.ru/strik?utm_term=john+deere+455+drill+owners+manual
    • http://copyrighthelpcentral.com/vituferagubasodupimebekil64lnh.pdf
    • http://buyfastedcircle.xyz/78314136307ndhyv.pdf
    • http://phtech.site/do_i_watch_fma_or_fmab_firstmq9v7.pdf
    • https://sudodufutela.weebly.com/uploads/1/3/5/9/135960501/rovewutoxez_juritagiraredej_zedikube.pdf
    • http://frontglass.xyz/gejirisosal0id0m.pdf
    • http://jotijitod.66ghz.com/pakivaxokaforo.pdf
    • https://damujulul.weebly.com/uploads/1/3/5/3/135335913/6817da1d269.pdf
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/02e06738e802.pdf
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/3204874.pdf
    • https://cdn.sqhk.co/xanovika/hbiaFhb/suppository_for_hemorrhoids_during_pregnancy.pdf
    • http://tvoyoproc.fun/xovuputidotapokejegapvz08l.pdf
    • http://depalowivejal.iblogger.org/82290577857.pdf
    • https://gezalimod.weebly.com/uploads/1/3/1/3/131379194/8596429.pdf
    • https://cdn.sqhk.co/ruwonumatag/ibigajg/flower_zombie_war_mod_apk_home.pdf
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/7731f8da655305b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://daluxufugul.epizy.com/do_all_printers_use_the_same_ink.pdf
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_86f4603f38c94a9ca213edc0aa4e95bd.pdf?index=true
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_32d921bb17d24f5b9fd1e24606a3367b.pdf?index=true
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_8ebcb097a1864005977b14e335cb62c8.pdf?index=true
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_2db6cfda92b64851b8c2265c30edff3e.pdf?index=true
    • http://zenejifawulo.epizy.com/organic_crib_sheets_made_in_usa.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_off0000ec8c.bin
f55128cbcf0235be1cd7899bae3c7863b6fa487e29f5f61916cfefcfc7a84892		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 5160 bytes
font_01_sfnt_off0000fdf1.bin
99002849bb5851bd383695dc6fe6a7efe10cd68b436d95509fdaf25a311dbb0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 10728 bytes
font_02_sfnt_off000122b5.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122B5 4324 bytes

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