Malicious PDF — malware analysis report

Static analysis result for SHA-256 44849db1e5955093…

MALICIOUS

PDF

85.2 KB Created: 2021-03-01 01:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 37c49ed99c0f3f531e726e10c24a9d88 SHA-1: b4160884ed5229dcf84f9339d19fba63da83ccad SHA-256: 44849db1e5955093e5b380e73628fcc3ee3201eec8f0197b678b911b5a112bc2
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'how to open gameboy cartridge', suggesting a lure to trick users into clicking malicious links. The presence of multiple link farm heuristics and ClamAV detection further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=how+to+open+gameboy+cartridge In PDF document text
    • https://cdn-cms.f-static.net/uploads/4425224/normal_601b9a8145362.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476123/normal_5fca3f60d9c03.pdfIn PDF document text
    • https://dogerisu.weebly.com/uploads/1/3/0/8/130874322/8168903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488837/normal_5fd93b12d8173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_6020b3185068c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392220/normal_602623ec00797.pdfIn PDF document text
    • https://wajiwojoduposop.weebly.com/uploads/1/3/1/3/131379590/bapesiw.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/nozuvimujisufarop.pdfIn PDF document text
    • http://jepewadagamer.scienceontheweb.net/golf_buddy_watch_wtx_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485579/normal_5fcd2679e7d26.pdfIn PDF document text
    • http://tasefuvakol.22web.org/lojetov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389793/normal_60040e760aaf9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367277/normal_5fcabbc414831.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/what_is_the_main_cause_of_gang_violence.pdfIn PDF document text
    • https://komijeji.weebly.com/uploads/1/3/1/6/131606126/dca8f539ea566f5.pdfIn PDF document text
    • https://kujiguvasate.weebly.com/uploads/1/3/4/5/134584602/8705765.pdfIn PDF document text
    • https://vijibasotaxeja.weebly.com/uploads/1/3/5/9/135990507/8545122.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wosunitiguzivef.epizy.com/podugesemoxinanaza.pdfIn PDF document text
    • http://widabuve.epizy.com/44925060858.pdfIn PDF document text
    • http://kigodugenuv.rf.gd/67295036427.pdfIn PDF document text
    • http://zitawajizotifam.epizy.com/venovusadudajusavo.pdfIn PDF document text
    • http://jaxarafepemu.epizy.com/letterhead_template_free.pdfIn PDF document text
    • http://dasufolizimifub.rf.gd/56031354008.pdfIn PDF document text
    • http://dobuwawag.rf.gd/lenovo_thinkpad_t420s_ram_upgrade.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 5480 bytes
SHA-256: 065a868c9df4c9a2822feb3f98fea281c34d0954067f9d3eb9353bbb380c5ef5
font_01_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 10476 bytes
SHA-256: 5ff387eed7eb0d276ad10a5c74ae5e65729c6f6aff4a87ce0017a9c1f0559cb2

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