Malicious PDF — malware analysis report

Static analysis result for SHA-256 5feae85fdde0f71d…

MALICIOUS

PDF

101.7 KB Created: 2021-03-26 09:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c5d53ded2718148e361ab29e13ec4d22 SHA-1: 25bd4e3900ac91bb69661824132f02de683e2b16 SHA-256: 5feae85fdde0f71db213bdfe28d2a59c33e4b1bc7586f0a840e132d20a49f4e1
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The embedded URLs and the heuristic firings strongly suggest this document is part of a phishing or malware distribution campaign, likely using a lure of free technical documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/award?keyword=dictionnaire+technique+anglais+fran%25C3%25A7ais+gratuit+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403271/normal_60240925b1de2.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/zilejanibikekop.pdfIn PDF document text
    • http://nobukuxokosiga.mypressonline.com/tipoji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489061/normal_5ff02a1e90fb8.pdfIn PDF document text
    • https://saboruxeketeg.weebly.com/uploads/1/3/4/8/134850947/murebikul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450249/normal_5fc683d2bd8e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469358/normal_6018f7d722ba8.pdfIn PDF document text
    • http://bewujasixi.mywebcommunity.org/99306419224.pdfIn PDF document text
    • https://xavabijikuz.weebly.com/uploads/1/3/1/6/131636819/6417449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475989/normal_60282281405b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460243/normal_5ff25d3221553.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366382/normal_5fe3b9641c1da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_601f16b3e498e.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/5349355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501961/normal_605b8dd06ceef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_1db40f86b30d4f478cacc356e1111ba3.pdf?index=trueIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_f79c6a123eb143eea146a4c7b8934f43.pdf?index=trueIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_851c8724d164411fa85b4b8526044e24.pdf?index=trueIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_24b429e11dea43f5b9c63eff06b16cf2.pdf?index=trueIn PDF document text
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_3195e30dc48e470c8bddd34df557b5e9.pdf?index=trueIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_aa48716d3e18476987d8502c29462fdb.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12791 5724 bytes
SHA-256: 6f617dba50babddb4417f6f023dfca66eed4f6e5cc65c165e126df89b797713f
font_01_sfnt_off00013abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABC 14044 bytes
SHA-256: 021b1ab389a138318e35eb90fa1391d23eb5f696e6ae6637923206c0210b7f33
font_02_sfnt_off00016657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16657 19600 bytes
SHA-256: 6bc8bbed104a06da6cbe8dad2c7c739f078c1d5d258b529b0f6334ae406ad8d2

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