Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f7d6f52f18fe6b…

MALICIOUS

PDF

67.9 KB Created: 2021-05-06 06:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 425099cd2c2c17c03fe0295c9e8f2bb7 SHA-1: b4eaa9bb63806bf923038f1de6805cc7a8eb62ac SHA-256: 78f7d6f52f18fe6bb7895ede58cea70b091d622de5be50b6059f01e9469257c3
196 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 links, many of which are part of an SEO link farm designed to redirect users to malicious content. The primary lure appears to be a 'parts manual' for Vermeer bc1000, which is likely a phishing or malware distribution tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, and the presence of embedded URLs suggests the document is designed to facilitate the download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=vermeer+bc1000+parts+manual PDF link annotation
    • http://cupe1.ru/guwepituligiwisaj1u13.pdfIn PDF document text
    • http://sentytld.online/balupu_telugu_ringtonesh1tmn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476567/normal_602db1afab501.pdfIn PDF document text
    • http://hamlikjorettoop.ru/ceramic_materials_science_and_engineering_exercises_answersvv8rm.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/avaya_2420_phone_user_guidejsicv.pdfIn PDF document text
    • http://buylettersonline.com/99753599228nm42q.pdfIn PDF document text
    • http://pushbiz.fun/how_to_fix_a_ti-83_plus_graphing_calculatoryitbp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392651/normal_6047f3927a942.pdfIn PDF document text
    • http://my-favshoph.online/69723981868kqmd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_602dffacbfdd5.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/vesubodufisi/kassadin_guide_s9_mid.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/16856845828.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_95180fee59f04c49be7d9c4f31d53e6e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fifomi/char_broil_gourmet_tru_infrared_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/laxigedaderit.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/nhsn_dialysis_reporting.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/87693690742.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/director_de_alimentos_y_bebidas_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/onn_bluetooth_headphones_manual.pdfIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_e1f8075d5bda49e19b9b523f83241d3d.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_off0000caca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 5380 bytes
SHA-256: 22fac4266cb17e7f7b51c1b7861e6d518bafa992e89fb86e9895da615a43cba2
font_01_sfnt_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 10548 bytes
SHA-256: 3eb7ca430b59e5a430d1280ddb206084ad22491d363bf50d08103b22eeab5e33

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