Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bf82f980998d54…

MALICIOUS

PDF

77.8 KB Created: 2021-04-01 21:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 78c040500832aa412cab0e1e2db2b11d SHA-1: b56cc49aeca8d89b4a2e416d0e125274836f9b45 SHA-256: 25bf82f980998d547b9465f69f652e785b06705bb544da5b85607f44c3b38672
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users by directing them to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://midufefew.ru/strik?utm_term=us+army+field+manual+30-31b PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460686/normal_6039f74bb3030.pdfIn PDF document text
    • http://weareanonymous.org/mudexijt66s.pdfIn PDF document text
    • http://labiosdewonda.com/rca_universal_remote_control_codes_fupv1b.pdfIn PDF document text
    • https://sekinejifupom.weebly.com/uploads/1/3/5/3/135350217/fcdaaf754db.pdfIn PDF document text
    • http://damvglaz6.xyz/98468967844z5c90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447631/normal_600c51e93edc4.pdfIn PDF document text
    • https://zuzilenew.weebly.com/uploads/1/3/4/5/134527977/8330664.pdfIn PDF document text
    • http://nonly.xyz/xodagapesoxumujewoverns9w.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/povaweferukijotus.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/4626050.pdfIn PDF document text
    • https://gelejidog.weebly.com/uploads/1/3/4/6/134688201/8d1bbd799edffce.pdfIn PDF document text
    • http://picsonair.com/database_manager_job_description_templateptnir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462075/normal_601fefa0aac1c.pdfIn PDF document text
    • https://bobidowi.weebly.com/uploads/1/3/2/7/132740787/juxinokinov_pevaxo_sijup.pdfIn PDF document text
    • http://edaruzal.xyz/59969909315zfns9.pdfIn PDF document text
    • https://panusefebile.weebly.com/uploads/1/3/5/3/135331690/nixoxu_sugep_vafodalovunarim.pdfIn PDF document text
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/gigirig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_3570c6aee7b7448fba47d95b17bdbcbe.pdf?index=trueIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_3e31a79f44e3476c9727ff87f209df4d.pdf?index=trueIn PDF document text
    • https://5c54d0bb-9de8-469b-abb1-33232a952ba9.filesusr.com/ugd/370e3f_169de7b8a19a47c0b6a08dbe742412e4.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_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 5676 bytes
SHA-256: 17d45df399134df97c21db6560a90df30973ee06f15746664cb7c2d8cd7c18b8
font_01_sfnt_off00010529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 10704 bytes
SHA-256: dee8a87d7ddf41ce50ead01ba930499924234cbd053c865f854d4bfb3f9dab6f

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