Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2779f72b12cc86…

MALICIOUS

PDF

79.1 KB Created: 2021-04-07 05:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6746eedf2f1065628abe6149a3c989de SHA-1: 3c18fd8801424ffe3658690bff0c91eb136f3be1 SHA-256: 4f2779f72b12cc86a93fd1e79d220d3914daa7d90bbda0359064dd1b95868186
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, suggesting an effort to manipulate search results or distribute malware via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://rusaleti.22web.org/84154369830.pdf
    • http://zuwaweno.iblogger.org/86523971193.pdf
    • http://euroshopmn.space/how_do_you_fix_a_printheadzssf4.pdf
    • http://zifeladawu.scienceontheweb.net/jutunanekerikufu.pdf
    • http://xanusojuruxu.sportsontheweb.net/how_to_replace_shark_rotator_filters.pdf
    • http://gukevipagopu.mywebcommunity.org/wegubibodaxofijejif.pdf
    • http://gratoramaa.website/95314177884vrb1i.pdf
    • https://muzezibabut.weebly.com/uploads/1/3/0/7/130739211/beb3175aa018fe0.pdf
    • http://nuwevabufa.mypressonline.com/bestanden_samenvoegen_1.pdf
    • https://fujifarilopo.weebly.com/uploads/1/3/4/4/134483008/kajokutesepozubi.pdf
    • https://malugeko.weebly.com/uploads/1/3/1/6/131636988/c33295e65e43.pdf
    • http://thehensleys.org/who_gmp_guidelines_2018itriy.pdf
    • http://talemine.getenjoyment.net/42917756733.pdf
    • https://detalejutapebis.weebly.com/uploads/1/3/4/6/134610814/6c414eb9ac8.pdf
    • http://jotitojimo.mygamesonline.org/python_data_analysis_free_online_course.pdf
    • http://biomanua.website/2005_buick_lacrosse_heater_core_replacement_costgoomw.pdf
    • http://dresdenpharma.ru/17081479431p0b31.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/_7yJ53orglQ/wb?keyword=what%20does%20the%20word%20bardo%20mean%20in%20english
    • https://uploads.strikinglycdn.com/files/5a9cbec1-7745-45d2-8377-f5a2f9720e5a/13855234144.pdf
    • http://siwemoxoxawevuv.atwebpages.com/47558959192.pdf
    • http://nogomazarem.epizy.com/5654301305.pdf
    • https://uploads.strikinglycdn.com/files/eb5c1878-5048-4b13-afab-f3797b84ba31/44372672409.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f822.bin
c8c2287e6b8198a44efbe54e12c9ca0d61ea2e31b9c77ded311e7c5327b8591f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 5484 bytes
font_01_sfnt_off00010ab1.bin
01574e16a993b120bca519abd0cfbdb4b285000c512c6a93697fca830ed5450e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 11048 bytes

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