Malicious PDF — malware analysis report

Static analysis result for SHA-256 6157bee9e39c401f…

MALICIOUS

PDF

85.1 KB Created: 2021-05-16 22:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 86710bfa25ab40de2b34a3e873b5f692 SHA-1: 999230482d8a3f50ce75c355120ce3d79c9db458 SHA-256: 6157bee9e39c401ff338c8298d1d7599db9af231201924b4f128087a05004709
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO-optimized PDF documents hosted on platforms like Weebly and S3. The primary lure appears to be a trailer for 'My Cousin Rachel', which redirects to a URL containing 'strik' and UTM parameters, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://zajinet.ru/strik?utm_term=my+cousin+rachel+trailer+deutsch PDF link annotation
    • https://sarogixi.weebly.com/uploads/1/3/0/8/130813770/mibigevozepolap-xularegote.pdfIn PDF document text
    • https://digaporabanezaf.weebly.com/uploads/1/3/4/6/134689005/0dec39fe937545e.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/hbFhfzs/wonemarozezetowejupak.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/igiLcHj/windows_media_center_fm_radio_tuner_download.pdfIn PDF document text
    • https://pufinixebajev.weebly.com/uploads/1/3/0/8/130873949/buxasogajizi.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/7510278.pdfIn PDF document text
    • https://rupafiwizumuwon.weebly.com/uploads/1/3/4/4/134442684/nuvimimiv.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/safago/durodukivigudesolixexok.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_f52c3f06a5a04aba934adb6dbdcf424a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divikufifir/how_to_make_a_peace_offering_to_a_boyfriend.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/alpha_conference_centre_information.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/marcy_deluxe_utility_weight_bench_sb-350_review.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/47413080984.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/50205021846.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_43ac5378718a41d5819b67e8a9701b28.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/xilolikurotazomaso.pdfIn PDF document text
    • http://xomesozumifa.rf.gd/thanos_endgame_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/lowonolexupo.pdfIn PDF document text
    • http://parorusoba.rf.gd/login_template_bootstrap_asp._net_mvc.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_423e644c84634a7f8c42472b15d5843a.pdf?index=trueIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_222e14fe2d6f4c459778fe701d9317bb.pdf?index=trueIn 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_off00010dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 5136 bytes
SHA-256: b81b820a50a6335bd32a7219f4fba9209cc49146154144002ec87e39c0837fcc
font_01_sfnt_off00011f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4C 11636 bytes
SHA-256: 7b8bac25e814c009d7950b55786888a424683604e343e572f7908cf58c733cd2