Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b94e0213f2b7f82…

MALICIOUS

PDF

90.0 KB Created: 2021-02-14 15:35:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 353c63e3425181ad2cc99b6d171c00e6 SHA-1: eac424540d297e721603eb25ddc7be170113cfec SHA-256: 8b94e0213f2b7f82916d749904c0d314e5770849691580d463c52c11132fcd45
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample's structure and embedded links suggest it is designed to lure users to external sites, likely for phishing or malware distribution, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/123?utm_term=bernardo+o%2527higgins+founder+of+modern+chile In PDF document text
    • http://sowaviwexurejo.22web.org/free_multiplication_worksheets_for_third_grade.pdfIn PDF document text
    • http://doxisolawasusig.66ghz.com/agar._io_bot_hack_no.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/fihlQSg/75904739683.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/gfPjfjd/world_war_2_memorial.pdfIn PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/tonajomekigiwin.pdfIn PDF document text
    • https://gupekuvexo.weebly.com/uploads/1/3/4/6/134610658/8697747.pdfIn PDF document text
    • http://xonirur.iblogger.org/8639317382.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/if2idhc/ramegetevasoxonizep.pdfIn PDF document text
    • https://kesesitevon.weebly.com/uploads/1/3/5/3/135317357/397431.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/iiQt9he/kutoferatefutuw.pdfIn PDF document text
    • http://sunipemumax.66ghz.com/janatha_garage_songs_naa_songs_org.pdfIn PDF document text
    • https://tifozemeg.weebly.com/uploads/1/3/5/3/135325228/saviledazog-fuwanuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vemewef.rf.gd/m_a_powerpoint_template.pdfIn PDF document text
    • http://dinelak.rf.gd/nobatomukigose.pdfIn PDF document text
    • http://foripoj.epizy.com/lezetivuxuf.pdfIn PDF document text
    • http://fazemiwasagi.epizy.com/72682491681.pdfIn PDF document text
    • http://famosubapaji.epizy.com/accounts_payable_audit_reports.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_off00011fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD0 5516 bytes
SHA-256: 86fe7e79fd802d0e72737a78157a2dbb16f31199c12d7fb24cc26363d806d29b
font_01_sfnt_off00013271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13271 12196 bytes
SHA-256: 8f0616c4ec6fbf152b6e0d9a2ab698cdf5618d6a756c43fd6f01b74b1a5010dc

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