Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd23ca9fa0845f0…

MALICIOUS

PDF

72.3 KB Created: 2021-02-22 02:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dc623bdc838591c91781a11edfdfb3f6 SHA-1: a5158fe0a5005b7fcd5fde2b710e0df5b419033f SHA-256: dfd23ca9fa0845f05bd9891adef32303572d50b048c8b639062d4f97f64a6d1f
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain, likely serving as a download or redirector for a secondary payload. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to exploit user trust for malicious purposes, possibly through embedded JavaScript or other active content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=dell+optiplex+755+drivers+for+windows+xp+64+bit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387408/normal_5fd6229585394.pdfIn PDF document text
    • http://xolerimulig.22web.org/69143352900.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/firefox_52_esr_32-_bit_filehippo.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/29262163482.pdfIn PDF document text
    • http://bevonox.epizy.com/aquage_transforming_paste_alternative.pdfIn PDF document text
    • http://pazutoxun.epizy.com/tidegerobutenawojotitored.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/reratililalup.pdfIn PDF document text
    • http://xewofikedufika.epizy.com/what_are_some_effective_communication_and_listening_skills_for_teams.pdfIn PDF document text
    • http://fodapimogu.rf.gd/radusi.pdfIn PDF document text
    • http://xumugipetoje.epizy.com/magic_chef_ice_maker_manual_mcim30ts.pdfIn PDF document text
    • http://kuxomexepus.epizy.com/sanenesinenenononilufufu.pdfIn PDF document text
    • http://gefuxexo.epizy.com/ultimate_ears_boom_speaker_review.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/giving_opinions_worksheet.pdfIn PDF document text
    • http://miseparasunafit.rf.gd/40618559052.pdfIn PDF document text
    • http://kalilom.epizy.com/vonemijowibupega.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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 5632 bytes
SHA-256: 5e5bb53b6dd822f96ffa2a07279dd3adecabf1823f723bcd19344f09b55b25f5
font_01_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 10592 bytes
SHA-256: ac71e06cf940c4fa841cac20c7c38f97e6a86dd46a54a9950b54cd1b580b7c1f

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