Malicious PDF — malware analysis report

Static analysis result for SHA-256 231628178511add7…

MALICIOUS

PDF

79.3 KB Created: 2021-04-07 23:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 694ff61d9dbe1034f5a2a68751f92cbc SHA-1: ed0419c3c1ba180311c41c86625993e8f60cb707 SHA-256: 231628178511add7c413e7278edbd93e5076b372b452feee2ad76bd0ffb2e65c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing and malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious. The presence of external URIs and the overall structure suggest an attempt to redirect the user to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://soxebez.ru/123?utm_term=negative+unrestricted+net+assets+on+balance+sheet
    • http://gusevoxuzuwelap.mywebcommunity.org/32731209318.pdf
    • https://powinategirax.weebly.com/uploads/1/3/4/7/134736766/funuzumivezurep.pdf
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/xufegavifisekat_wedawogutoxeg.pdf
    • https://static.s123-cdn-static.com/uploads/4471234/normal_5ff3c05531531.pdf
    • https://static.s123-cdn-static.com/uploads/4465719/normal_5fec67ba51231.pdf
    • http://nabavawuzafurur.mygamesonline.org/uk_driving_theory_test_book_in_urdu.pdf
    • http://nigodofifulo.scienceontheweb.net/phanerozoic_eon.pdf
    • https://mepowisa.weebly.com/uploads/1/3/4/5/134595914/wawizusaduf.pdf
    • https://cdn-cms.f-static.net/uploads/4415045/normal_6067bf59b3bde.pdf
    • https://static.s123-cdn-static.com/uploads/4384832/normal_5ffd26f28f2c2.pdf
    • https://jegivobepumo.weebly.com/uploads/1/3/4/4/134444156/9974599.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6f323bc3-7ed6-4d67-aea3-92f9f3675c79/morafogem.pdf
    • http://serimaziwexibov.epizy.com/besiw.pdf
    • http://menepukezovexo.epizy.com/barron_s_sat_1_vocabulary.pdf
    • https://uploads.strikinglycdn.com/files/3c6612b4-0fc5-453d-8922-90eded8ef3e8/pepopetupivebalifiwon.pdf
    • http://supuwevul.atwebpages.com/90047583777.pdf
    • http://vegubom.atwebpages.com/bertha_becker.pdf
    • 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_off0000f72a.bin
851a5fc916b4d7fcd2ff0133b728e5e40db579377b992435f46fa85e0312bbda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 5372 bytes
font_01_sfnt_off00010970.bin
ff8abd1a5901459fc4b3177466ac3f67286873bda5f38ca59b332bd570776e78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 11412 bytes

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