Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c897fd648cf6a8…

MALICIOUS

PDF

85.4 KB Created: 2021-10-14 04:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7513a23c94c01665eddb5ac8fa0ee25b SHA-1: f6b35064679baee88f30cc820cb9ded3c2a6defe SHA-256: f3c897fd648cf6a8b145539836cca2d9c54444e4cdd645d85b8a32268f7d5700
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. ClamAV and ML classifiers also flagged it as malicious, specifically as a phishing trojan. The presence of many external links suggests an attempt to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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 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 http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/81886564668.pdf In PDF document text
    • http://constantemail.com/userfiles/file/1633003612xeremuwedozonogavu.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/jeraru.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/37338302878.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/28264671922.pdfIn PDF document text
    • https://questfran.com/broker-site/files/files/51595771534.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/64d131bb9787a718b99346f27a942e20/gedusiwep.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/57459089903.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/pakelozunazasuked.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/p7laulumhtjmv64ipvs0v22u90/rinoxunakores.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/31425489987.pdfIn PDF document text
    • http://www.tecnobor.es/ckfinder/userfiles/files/65474222918.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/rowezulajuta.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/14102863967.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109071509257380.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/12851609057.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/40379734473.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/geneg.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///77950775509.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/mefufirerujule.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/wuvelufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/oscUj7J0Gjw/uplcv?utm_term=engage+in+diversity+and+difference+in+practicePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 10792 bytes
SHA-256: 08ffbc99fa9b427d702186aaaa3fc1dcaef20a6a5c1be2a6504388a96f66774c
font_02_sfnt_off000118d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D5 18064 bytes
SHA-256: 3bd7dc879a0178e8fe6a01b1f4ba5e968ec49fc4c064081c65d25bc7c464cd63

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