Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c16fa6d4c9e673f…

MALICIOUS

PDF

77.9 KB Created: 2021-02-28 23:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7a9cb8bae2dbd9e07d64afe6b94aec6d SHA-1: cf359141d73fb2735913c292d3ba6e063ea89a73 SHA-256: 9c16fa6d4c9e673fb77629b581781789e5851ac8a08e486ee11783091eabd13d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external URIs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, contains text related to 'air purifier' and 'hepa filter', suggesting a lure to attract users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crophysi.ru/strik?utm_term=best+air+purifier+with+hepa+filter+uk PDF link annotation
    • http://gaxazoxisis.22web.org/char_broil_tru_infrared_electric_grill_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/aijgzhe/guilty_me_meaning_in_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481671/normal_5fc56c0364f1d.pdfIn PDF document text
    • http://egrn-order.online/piada_de_ary_toledo_como_ou_elefantet56au.pdfIn PDF document text
    • https://naxomusiji.weebly.com/uploads/1/3/1/6/131606859/4419336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460043/normal_60181c26efa1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450438/normal_5ff9c174e0644.pdfIn PDF document text
    • https://vivimudovulab.weebly.com/uploads/1/3/1/4/131437737/8831067.pdfIn PDF document text
    • http://bnl-jobs.com/beneficios_lactancia_materna_exclusiva_omss3igm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_603aa7f88518f.pdfIn PDF document text
    • https://dutebosolet.weebly.com/uploads/1/3/0/9/130969562/sorubimo.pdfIn PDF document text
    • http://bomawowaziwan.iblogger.org/android_one_que_significa.pdfIn PDF document text
    • http://prizinsta365.website/coordinate_geometry_worksheets_and_answersftx5j.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/KidjinG/buwogogusogatudetamiz.pdfIn PDF document text
    • http://nawididu.iblogger.org/80097958627.pdfIn PDF document text
    • http://covid-19online.site/82430986692dk1ri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479470/normal_600041b7a8a00.pdfIn PDF document text
    • http://bukezisafa.iblogger.org/portland_1750_psi_pressure_washer_wont_turn_on.pdfIn PDF document text
    • http://carbags.site/dimonenufevopadajupakivajfachy.pdfIn PDF document text
    • https://zetaxufonepijak.weebly.com/uploads/1/3/4/3/134353616/razilosojunuga.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/bojafazes/free_music_albums.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/pdf_converter_compress.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/21428819900.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_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 5192 bytes
SHA-256: b9977b8eb72ce7a15cf43ebf2277b2e2051b97a8e8e8f198f91ba54cfa27c51c
font_01_sfnt_off000104ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104ED 10972 bytes
SHA-256: 4e34baa3bedfe8dd65debafe0786c1224fac5a08993e151197082ea1c5c42549

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