Malicious PDF — malware analysis report

Static analysis result for SHA-256 997392cb06a5782b…

MALICIOUS

PDF

76.6 KB Created: 2021-03-26 09:09:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4c6c44c3a9fea8286769c8d9578e0375 SHA-1: ddca3927f7afd0f5b58d2a496af71847c1abc6b3 SHA-256: 997392cb06a5782bb1aff69201816dc47decf68021c41d6e9cac96faf5e64cbd
126 Risk Score

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 0.9996

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://jottigo.ru/strik?utm_term=hyposecretion+of+growth+hormone+causes PDF link annotation
    • https://borirokuve.weebly.com/uploads/1/3/1/4/131437567/vokabomaso.pdfIn PDF document text
    • http://lishop.site/bosujexikilevebigjxyx9.pdfIn PDF document text
    • http://avtoshkola-region26.ru/pokemon_showdown_teams76d8o.pdfIn PDF document text
    • https://karivimefoga.weebly.com/uploads/1/3/4/3/134311068/4437409.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/gibjeUA/xapiv.pdfIn PDF document text
    • https://vulotimemoje.weebly.com/uploads/1/3/4/8/134846769/908826.pdfIn PDF document text
    • https://wobumobovutukom.weebly.com/uploads/1/3/1/6/131606412/9112865.pdfIn PDF document text
    • https://veminimuvaw.weebly.com/uploads/1/3/4/6/134630651/7852227.pdfIn PDF document text
    • http://albatros-trans.ru/todixazakomoxepukisije7tbbq.pdfIn PDF document text
    • http://tizuzagejuropol.22web.org/career_path.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/6IdBZdi/23549924866.pdfIn PDF document text
    • http://imedo.ru/67405590873lnx80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://favisosemetidid.rf.gd/62800841269.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/wubozugo.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/bowflex_xtreme_2_se_vs_pr1000.pdfIn PDF document text
    • http://bowegasobufur.myartsonline.com/cisco_linksys_e2500_change_password.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/scared_of_love_audio.pdfIn PDF document text
    • http://tanitiluwisiso.rf.gd/kudifivajizirepad.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/cabinets_to_go_measuring_guide.pdfIn PDF document text
    • http://bizitezejeg.epizy.com/focusrite_scarlett_solo_3rd_gen_2i2.pdfIn PDF document text
    • http://dilutibu.onlinewebshop.net/tofulovojupugetupovesu.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/88273970152.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_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 5552 bytes
SHA-256: 03cb76a8e1dac1b376c1cf2df18b01490fe88428dbca759925862c65874125bd
font_01_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 10608 bytes
SHA-256: 0b5d239968860e21b909a7c13a144228f7ee9f9e161b976692c1eb2d4926fd3f

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