Malicious PDF — malware analysis report

Static analysis result for SHA-256 df64b45e31e4e8a2…

MALICIOUS

PDF

100.8 KB Created: 2021-04-01 18:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b15eefe7a876c727c9982ff34cb467a7 SHA-1: 893315b44e5160fe2137fcca441bbc72bca898d9 SHA-256: df64b45e31e4e8a2b7f44894632d644f18ceea8b505812e4345ecbf631d755d3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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/wix?keyword=black+desert+alchemy+leveling+guide In PDF document text
    • http://rajelakitapeki.iblogger.org/43580212977.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/jIx7VMR/fundamentals_of_actuarial_mathematics_1.pdfIn PDF document text
    • https://cdn.sqhk.co/zewezerezi/Chbzjdd/36414660784.pdfIn PDF document text
    • http://zinifezabi.iblogger.org/35227299391.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/842b10f6b.pdfIn PDF document text
    • http://milafikolume.iblogger.org/us_passport_renewal.pdfIn PDF document text
    • https://cdn.sqhk.co/fobonelaga/hjggjem/visit_florida_commercial_2019.pdfIn PDF document text
    • https://gadabuji.weebly.com/uploads/1/3/4/7/134715747/f372b17ba08eeb6.pdfIn PDF document text
    • http://bigakeka.iblogger.org/gipevozokimit.pdfIn PDF document text
    • https://cdn.sqhk.co/gotofebelu/idsvje7/47997807038.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xokudotux.rf.gd/bsc_2nd_year_chemistry_practical_book.pdfIn PDF document text
    • http://valopuloti.rf.gd/how_to_remove_a_hard_return_in_excel.pdfIn PDF document text
    • http://velidukaka.epizy.com/marco_island_backwater_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/g_subbarao_ethics_book_in_hindi_download.pdfIn PDF document text
    • http://poresiz.epizy.com/40554850183.pdfIn PDF document text
    • http://vubenotabajumem.epizy.com/simile_poem_form.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/kipobosototewosudaj.pdfIn PDF document text
    • http://sinuwosoko.rf.gd/22043941053.pdfIn PDF document text
    • http://modamelipoduwi.rf.gd/31765430623.pdfIn PDF document text
    • http://xavifitumar.rf.gd/pediatric_advanced_life_support_aha.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_off00014aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AED 5628 bytes
SHA-256: 8f85babad3f37d2a6ef4e4301798d9644079c64e5f366d9159f22acb48f857aa
font_01_sfnt_off00015df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF7 11408 bytes
SHA-256: fff2b170ca8407869aa21430b1f760e5b52438e9177d82bd2eba88ec821552a2

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