Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f84dcd693946992…

MALICIOUS

PDF

126.5 KB Created: 2021-04-19 22:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f0b0442862e7b4beadc99b660fb03098 SHA-1: ca2651c9aea1ec84a5461d72f184e00c5d0ff04e SHA-256: 9f84dcd693946992c6687c325cf9192ca74ed288fb17300440835b57344f668e
184 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs pointing to disposable domains, with at least one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to medical devices and wkhtmltopdf, suggesting a lure or disguise for the malicious links. No scripts were extracted, but the presence of numerous links to potentially malicious infrastructure strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/strik?utm_term=wireless+communication+medical+devices In PDF document text
    • http://kodimovizi.22web.org/sekuxelu.pdfIn PDF document text
    • http://rodufedizukol.22web.org/access_consciousness_tools.pdfIn PDF document text
    • http://powogole.iblogger.org/os_axiomas_de_zurique.pdfIn PDF document text
    • http://tuzazigigub.iblogger.org/access_vba_form_borderstyle.pdfIn PDF document text
    • http://pesuzukotejoki.iblogger.org/josafifugisojusazefep.pdfIn PDF document text
    • http://gagewetero.iblogger.org/86879483229.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/3610514869.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/2020_wall_calendar_uk.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/adverbios_em_ingles_exercicios.pdfIn PDF document text
    • http://kajejib.medianewsonline.com/berizoxig.pdfIn PDF document text
    • http://vikorurapufor.iblogger.org/wazenezozid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rafopaju.rf.gd/telecharger_whatsapp_plus_apk_2018.pdfIn PDF document text
    • http://diwifesatikebak.epizy.com/how_long_to_cook_sirloin_steak_in_george_foreman_grill.pdfIn PDF document text
    • http://netozovozuze.rf.gd/xojexara.pdfIn PDF document text
    • http://tavamikilav.myartsonline.com/lebarafodojiv.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/90111366651.pdfIn PDF document text
    • http://birukuf.onlinewebshop.net/explain_budgetary_control.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/zigivuvaguguzabenafilara.pdfIn PDF document text
    • http://benepuru.epizy.com/personal_pronouns_exercise.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/do_electric_hot_water_tanks_have_pilot_lights.pdfIn PDF document text
    • http://vuvulew.rf.gd/13329408663.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/44154766843.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/jaguxapelewegazur.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_off0001b387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B387 5160 bytes
SHA-256: 2d077cf74f27d1d6273b861775fb5e52dfdd3330d9105325bec73ce456f2fd11
font_01_sfnt_off0001c508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C508 12216 bytes
SHA-256: ba1c49cdb30cf29b07fbb2ff3507b24452fc59bb4ad851d0f2047a640257712c

Open this report in the interactive analyzer, or submit your own file for analysis.