Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bb09d3b5761073…

MALICIOUS

PDF

71.9 KB Created: 2021-02-27 08:51:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f847b9f73a863c8f4a345fc96ab0335f SHA-1: b154748a8ae803dc66cfb93948fb94c9409ec055 SHA-256: d1bb09d3b576107318fc6ab06bc69900bef25869ff43d10f40779b04c98ed50f
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://seumenha.ru/123?utm_term=brother+p-touch+pt-d210+label+maker+refills PDF link annotation
    • https://cdn.sqhk.co/guzupewad/qaojcid/ninja_coffee_bar_recipes_iced_caramel_macchiato.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxiwugo/i9gjifZ/diversity_meaning_in_telugu_definition.pdfIn PDF document text
    • http://bigtittybella.com/98956279766d257h.pdfIn PDF document text
    • https://mifavawuzizadax.weebly.com/uploads/1/3/5/9/135977912/sevesij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_601f1e3c47b19.pdfIn PDF document text
    • http://help-nanny.site/age_of_empire_2_hd_freew0xi5.pdfIn PDF document text
    • http://meriline.store/bedesipivolitolobojuxr2p.pdfIn PDF document text
    • http://mivetys.xyz/98385253309oyo6g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472788/normal_600155aa8cb69.pdfIn PDF document text
    • http://topcabinets.xyz/the_monkeys_paw_round_charactersysto8.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/supefujoxopubu/avery_template_5366_online.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/noduvesefufojaxedo.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/airman_information_manual_2018.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_off0000d698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD698 6008 bytes
SHA-256: 9644ba20680ed0e7a5c9200d91d5d4efee683a03487ad98986c6733aa2873838
font_01_sfnt_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 11040 bytes
SHA-256: a83b50d178ac437b2100e7d6ae0b1c83c3db8070d8f4d26b45a217a3d4e588c8

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