Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f75aa7a1522d792…

MALICIOUS

PDF

77.1 KB Created: 2021-03-11 15:52:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6038154f98a5c6f38894e4c613cc885d SHA-1: b4ba96a57d6b7114cf464db5eacd29297d7bfdef SHA-256: 7f75aa7a1522d79291ac28e26cb4467363f0f0acd142640413a78aa7545c043a
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to disposable domains, suggesting a link farm designed to distribute further malicious content or phish users. The presence of embedded URLs and the structure of the PDF indicate it's likely part of a phishing campaign, possibly using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=syma+x5c+app PDF link annotation
    • http://leqqurint.online/business_management_books_for_shsz1obm.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/dyson_v6_absolute_reviews_uk.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/41735233977.pdfIn PDF document text
    • http://vizionsmc.net/31958882037kcz4j.pdfIn PDF document text
    • http://fofolep.mywebcommunity.org/37201628779.pdfIn PDF document text
    • https://cdn.sqhk.co/tagubutapa/jMVrihp/28677578933.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/Jgcggih/25391202701.pdfIn PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/347685.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/dododuxi.pdfIn PDF document text
    • https://datovize.weebly.com/uploads/1/3/4/5/134508179/486881e841.pdfIn PDF document text
    • https://wimukevefom.weebly.com/uploads/1/3/0/7/130739067/5574228.pdfIn PDF document text
    • http://naturwows.space/company_profile_indesign_template_freeephst.pdfIn PDF document text
    • https://cdn.sqhk.co/lilanoto/IThg8im/bnk48_oshi_festival_apk.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/cc96a.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/5552cf56-a8a3-4843-b3a5-67f26b265ae1/silenimukewemigewogaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecdc71f7-3d16-41ad-a5e6-06d7d32e1b5e/xbox_one_controller_wired_not_working_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6141fc70-2931-423a-a830-c34141a859fa/what_is_the_role_of_church_trustees.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d32ef1ef-839f-42e3-aa41-52f974612eb6/waterpik_ultra_and_nano_water_flosser_combo_pack_costco.pdfIn PDF document text
    • http://nibopinalilabaj.onlinewebshop.net/how_to_update_fire_tv_recast.pdfIn PDF document text
    • http://pigutun.myartsonline.com/zovuvotegalerox.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_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 5168 bytes
SHA-256: 91b6818105360df000de1e5b900aaf9c98291b27ce5a1ab495cc71beddb120cb
font_01_sfnt_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 10580 bytes
SHA-256: 5a6163f5d64359446b1615ccfa91a47f01d9dd55c47c481c57cf2c2dad856631

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