Malicious PDF — malware analysis report

Static analysis result for SHA-256 862db608f85a5d70…

MALICIOUS

PDF

72.8 KB Created: 2021-03-04 23:15:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 402e64c86fb3f5814446019f1325775d SHA-1: 1bcd1b69dd750f9240aa4bcd4becfc244fb30a10 SHA-256: 862db608f85a5d70f729a87a303ad925dd90b5eb0acb871a112382edb2cdd3f9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and includes a URL with a 'utm_term' parameter suggesting a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://botokaw.ru/aws?utm_term=tiaa+cd+rates
    • https://jiwosanoxonu.weebly.com/uploads/1/3/5/2/135299962/51015cf4163ce83.pdf
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/067763.pdf
    • https://tedogiji.weebly.com/uploads/1/3/0/7/130775371/tosimogura_tutiwepagejito_fumilusariv.pdf
    • https://ritiburup.weebly.com/uploads/1/3/0/8/130814353/7722e.pdf
    • https://vuvoxuwamulixa.weebly.com/uploads/1/3/0/7/130739220/fizodoniwijeva.pdf
    • https://xisipoven.weebly.com/uploads/1/3/4/2/134266343/forokovixasor.pdf
    • https://nafesidupige.weebly.com/uploads/1/3/2/6/132680955/kezasawew-xawegi-xuwet.pdf
    • https://sugelazo.weebly.com/uploads/1/3/4/7/134767002/39740b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_865e00615f9d4c2794d63859c049efa7.pdf?index=true
    • https://s3.amazonaws.com/wusigipufuvowix/kezegarekamepafijokogeno.pdf
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_f6997be8538540b9a7e48f6862752890.pdf?index=true
    • http://mijovutotukedes.onlinewebshop.net/60651408749.pdf
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_dde3d738e7a44e699cc773e4621433c0.pdf?index=true
    • https://s3.amazonaws.com/midaguvimabof/wazamemidid.pdf
    • https://s3.amazonaws.com/faluzotixupi/ackerman_steering.pdf
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_c390a1be7ba94b9ba97a09e43e6a009b.pdf?index=true
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_6c2ebc238a254ed581750a2e3d5e434e.pdf?index=true
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_8101750def3e47f290758c99446115f9.pdf?index=true
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_f4b4c492865749cc8d6fd0ad6fe3115c.pdf?index=true
    • http://ligoroxenafof.atwebpages.com/judipesokivu.pdf
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_689807bae4e24c9e9f0d7eac1ded7f67.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f2.bin
e0589d03429979990947fc5e28b8af84a07933f5649184f2ed9b58d06ecbc1a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F2 4848 bytes
font_01_sfnt_off0000f177.bin
8ecd4b28705d7b8d51b32ab993df8ba0809e3a3554171296f6c793ff1429fa03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 10940 bytes

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