Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfe1fd7aae015bc…

MALICIOUS

PDF

76.2 KB Created: 2021-04-04 11:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 596f0203d0430fb5a0120fa2757ce0c4 SHA-1: 63eb668f3d16edcad6502138884acd6298269773 SHA-256: 8cfe1fd7aae015bc2d5addcfa338d4920bfeb9cc95ae5723ea165788c5c48128
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious content.

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 https://zajinet.ru/strik?utm_term=how+a+balun+transformer+works PDF link annotation
    • http://vitonidero.medianewsonline.com/green_bay_packers.pdfIn PDF document text
    • http://jodopafipunew.22web.org/solventes_proticos_y_aproticos.pdfIn PDF document text
    • http://suzupuwejal.mygamesonline.org/84851297975.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/bonudexo.pdfIn PDF document text
    • http://wefilevazobakeb.mypressonline.com/how_much_is_a_battery_for_a_2012_toyota_camry_hybrid.pdfIn PDF document text
    • http://foriponawu.iblogger.org/72631667800.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wonuzewidej.epizy.com/how_to_pair_plt_m70.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b054621f-e326-4ed7-98df-f790ca712bde/adobe_premiere_pro_cs6_freeze_frame.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/how_to_renew_mississippi_drivers_license.pdfIn PDF document text
    • http://tuxabatadifu.onlinewebshop.net/77305000840.pdfIn PDF document text
    • http://wiferowifi.rf.gd/zuroruroregefawoximaz.pdfIn PDF document text
    • http://nabesazuxipuf.epizy.com/xunitusabofuxudadapo.pdfIn PDF document text
    • http://kowotasube.epizy.com/2787641906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5784648-bd6f-4461-bf83-43d0b0aed108/xexozugeviwof.pdfIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/ncfm_technical_analysis_module_download.pdfIn PDF document text
    • http://vepisesilutez.epizy.com/2579450877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/309d621b-1140-4431-96c8-5148d327a8ad/what_is_the_salary_of_a_compliance_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c68d4267-e4ba-4f0f-86a2-64f086bd44db/68817081470.pdfIn PDF document text
    • http://bokakemipik.epizy.com/jedoguvosulop.pdfIn PDF document text
    • http://fepujivorer.epizy.com/wujabiwuwunufobiveboliwu.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_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 5168 bytes
SHA-256: 87a8ec037678f6df94454188ab90413a0baaa0d18620e8a932041abc7f189f5e
font_01_sfnt_off0000fda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 11228 bytes
SHA-256: 9739a0efff27ddd0f117c36d832fe60e46aa59a26b59dd0c5ce4f1f3f3d9823c

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