Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8d9bf41e956fc9…

MALICIOUS

PDF

71.9 KB Created: 2021-04-24 23:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b97be7f958ba3a292298b3ae939a3561 SHA-1: dec8413baa81d8a8a94f2a04e7e150b3a55e6c8c SHA-256: 8a8d9bf41e956fc9210545f38451dab2d80b40a65f9e062d7b73658ac220df92
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://soxebez.ru/strik?utm_term=how+to+remove+thermostat+cover+to+replace+battery PDF link annotation
    • http://silewugebed.scienceontheweb.net/23683530120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466673/normal_5fd8588cdff19.pdfIn PDF document text
    • http://risimog.mywebcommunity.org/ap_grama_sachivalayam_syllabus_in_telugu_2020.pdfIn PDF document text
    • http://lebojabufi.medianewsonline.com/74819163144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458404/normal_6045bef18bb2e.pdfIn PDF document text
    • http://jojazinex.mygamesonline.org/baby_g_shock_pink_watch.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/algorithmic_trading__quantitative_analysis_using_python_udemy.pdfIn PDF document text
    • http://xevamoz.mygamesonline.org/14414126636.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/vazisi/us_army_survival_knives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bad0bec4-e43e-45e5-b93d-0129d64815eb/forty_rules_of_love_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/95330381431.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/lavutur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c27d14-475f-4788-8e93-3b60e13619d6/kung_fury_trailer_david_hasselhoff.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/dilami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fa62821-c49c-4157-898a-5da2ae66190d/kenmore_elite_washer_he3t_error_code_f21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3e9a2c-cfca-4617-bda5-a6edd4b1d9ab/safety_not_guaranteed_full_cast.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_off0000dc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6A 5528 bytes
SHA-256: c1c7044612748ede56275b1ee112416f407035d7bd1e777bf26cc9e1dcf38125
font_01_sfnt_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 10440 bytes
SHA-256: 9911c237852421639900560ae49f699b3a1f7cedd64a211a4f32924344944ec2

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