Malicious PDF — malware analysis report

Static analysis result for SHA-256 324d8492ebed129b…

MALICIOUS

PDF

81.3 KB Created: 2021-04-04 23:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3b3c0e420e448d9c108899c3abd50547 SHA-1: d0ff881b3c04244a9d4de6b7321f54146a0cafcf SHA-256: 324d8492ebed129be38b07dbac735c6bb6aa036340b849df5062658321f68a82
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation scheme. The embedded URLs are likely intended to redirect users to malicious websites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=how+to+start+a+conclusion+for+a+literature+review PDF link annotation
    • https://dulewexafup.weebly.com/uploads/1/3/4/7/134702005/ee4de4850.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/ifhgTie/tiralebefufaxunet.pdfIn PDF document text
    • https://dibatavuxod.weebly.com/uploads/1/3/0/7/130775672/3131492.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/PhagfEM/punizidapomuru.pdfIn PDF document text
    • https://xajerunufunofe.weebly.com/uploads/1/3/1/3/131378991/texikivanujelib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_600dc42b2ec57.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimurami/Jskjghb/secret_codes_for_blood_moon_tycoon.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/jwDjoOO/79518878231.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495841/normal_5febd00be607f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464068/normal_5ffb745ca85b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446388/normal_60275ce557abc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463560/normal_600623d9c93b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481271/normal_604f5e981d527.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guxajofiv.epizy.com/21412575823.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_7e73215baba04b6898573d0608dfa38c.pdf?index=trueIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_a4e6fa94921c4c5bb947025fc67b7778.pdf?index=trueIn PDF document text
    • http://gisinazujawapub.epizy.com/vojixomuluneloxutirel.pdfIn PDF document text
    • http://xegefonupekowa.epizy.com/86598860469.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_aa77f90ae4764e2fa111149be7dc870f.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_e22381724706412f9b65eb7d5bbe40e6.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 4988 bytes
SHA-256: cc92e950edb0f1fe1aeb9251e3c3f151342c4a3be56228831323dd3810fd74e2
font_01_sfnt_off0001130c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130C 10944 bytes
SHA-256: 16c6b06d1ceffb18c403ff42a7fc3ba1ca9ec5a853dbb11c8e52ebabb923a4a1

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