Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74c959e577c61f0…

MALICIOUS

PDF

73.3 KB Created: 2021-03-01 07:19:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 60df5aa3c8d2ad912be7a7eac96cf9cd SHA-1: 05b1c7ca7b815d426a571e70d475adc7b484d29a SHA-256: c74c959e577c61f09dae8b45092fa6ee4899f4efb473effe3171f371d472c7f2
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including those on disposable hosting, suggests a link farm designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's used as a lure for phishing or malware distribution, aligning with Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/aws?utm_term=ti+nspire+cx+ii+cas+charger PDF link annotation
    • http://avit0.cc/mejusalukirezvrzg.pdfIn PDF document text
    • http://molotkov.site/9604406974911nkb.pdfIn PDF document text
    • http://winoraama.fun/what_can_be_used_to_communicate_with_satellitesu3mwq.pdfIn PDF document text
    • http://premial.su/18574583446vc59w.pdfIn PDF document text
    • http://trujillostacoshop.com/morekapaxufa4vkkp.pdfIn PDF document text
    • http://repochka.site/wekalenoxawaxqwq.pdfIn PDF document text
    • http://kraftmann.su/career_portfolio_template_powerpointvhqkc.pdfIn PDF document text
    • http://immortal-sho.club/vodomonaxenonexezapaaxt2n.pdfIn PDF document text
    • http://aov.one/gepibuvugunrjlft.pdfIn PDF document text
    • http://probmaka.tech/report_writing_on_road_accident_in_bangladesh5ff01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://depezure.epizy.com/43129555616.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/11517974651.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/blackstreet_no_diggity_instrumental.pdfIn PDF document text
    • http://tidusuf.rf.gd/cdc_catheter_infection_guidelines.pdfIn PDF document text
    • http://jufazireti.rf.gd/ahir_image_hd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD250 4780 bytes
SHA-256: 5a4a1f08f001b0c59fdc51f8bc5eca7ed2187b085463f61fbabdd746cc99c85e
font_01_sfnt_off0000e26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 11280 bytes
SHA-256: c33732876c57a32ab97f0fcca9094fee072823a9898a79d97f95fd6d932ce26d
font_02_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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