Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3d1478494e5830…

MALICIOUS

PDF

74.4 KB Created: 2021-03-17 02:05:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d565f9e411060e8317b7aa676e384364 SHA-1: 4c0cb7ba4b528e8b233814621dce3aad7a0a4b26 SHA-256: bf3d1478494e58301a1d6d53a4187b22d6406458810cb4506bebd749a0560458
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm with many external URIs pointing to various domains, some of which are disposable. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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://jacksth.ru/award?keyword=quimica+organica+concepto+pdf PDF link annotation
    • http://tolunisusij.22web.org/nenurebowamanemavoxaxu.pdfIn PDF document text
    • http://vasavomuko.iblogger.org/apc_smart_ups_rs_1500_manual.pdfIn PDF document text
    • http://wovolutoxali.iblogger.org/breathing_colours_guided_meditation_script.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/889e80c8-c342-445c-9325-61ebac214ae4/fotunexewexosakota.pdfIn PDF document text
    • http://nupozefujelo.epizy.com/good_research_essay_topics_for_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8211b2f2-dca6-4a9e-b2fd-7f6fa3ae56b3/bosefarepugeso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce180deb-8aa8-493d-b794-ea9ac90c9338/arduino_uno_r3_cheap_price.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/89412465204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3c2bf45-f98d-4bf8-9ba6-979049da2475/what_is_a_business_proposal_essay.pdfIn PDF document text
    • http://vogizopenukese.epizy.com/zubowezetelejabefoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e40046f-9274-469d-b64c-b79d312e4753/69126138563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fda523d-e4c4-4edc-848b-877ee099c935/nutritional_value_of_arbys_roast_beef_sandwich.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb91fac-1c9e-4a8c-9f8d-1e140ee75958/zemeximuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2487454-0e44-41d5-8a98-7130b0e9e40d/pirame.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/free_bakery_logo_design_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/123ed3ce-9e8d-4c93-b6d8-307567dd6549/77866087959.pdfIn PDF document text
    • http://deravamosu.rf.gd/system_analyst_responsibilities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92090bfe-f3d9-4904-9bd7-ae808ec66c36/9153228554.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_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 5328 bytes
SHA-256: 788cbad8df002d4831c443e2910ba65bc4c8b45f7b0c6d037f653756b7c083bf
font_01_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 11888 bytes
SHA-256: f5f03e0b196d43730389bf8324e8c5a399ff4de17cab3d06338a0d0ce43e76cf

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