Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4563a45c62d54e3…

MALICIOUS

PDF

75.3 KB Created: 2021-04-01 08:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41ef6bf504568c0cfee72af2b5a7b9ca SHA-1: 76ec4790a3110a4ce4818bfdef4acb57c7f308ce SHA-256: f4563a45c62d54e385c9fd6bd662e0421cc8f0340c5a919748f14d157295b91e
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 hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/123?utm_term=chiari+malformation+and+pregnancy+labor
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/78dddd25a491.pdf
    • https://vakilonote.weebly.com/uploads/1/3/1/3/131382032/b337f47f7.pdf
    • http://gufurebu.medianewsonline.com/monster_vault_4e.pdf
    • http://rusakadovub.sportsontheweb.net/genetically_modified_organisms.pdf
    • http://pakunobun.getenjoyment.net/microwave_bipolar_transistor.pdf
    • https://weromosamewose.weebly.com/uploads/1/3/4/2/134265498/18750f15.pdf
    • https://vosuzupitozom.weebly.com/uploads/1/3/5/3/135313705/valikegoditili_xufetidirip_xidagum.pdf
    • https://sabadefupi.weebly.com/uploads/1/3/4/3/134345863/zumeginobelaxuf.pdf
    • http://riwozizedilar.mygamesonline.org/jojelegovowibamozimovovom.pdf
    • https://mubuvume.weebly.com/uploads/1/3/4/8/134885019/pujusak.pdf
    • https://dujililapute.weebly.com/uploads/1/3/5/3/135347223/0fd71e262e.pdf
    • https://nodopemewave.weebly.com/uploads/1/3/2/6/132682748/1009655.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1747caf2-50c5-4ace-8f30-8d3f4e2f7d49.filesusr.com/ugd/017962_c3aba47005144a4aa4f4c939ab785540.pdf?index=true
    • https://s3.amazonaws.com/tomamujuf/fitukiziwoverokogutoji.pdf
    • http://domuromu.atwebpages.com/rexovatededapanelemujemus.pdf
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_d0419177d20f46469abc86648db7bd6e.pdf?index=true
    • https://1b6a1bbc-c127-422b-858f-c975555fd18f.filesusr.com/ugd/31f47c_2af5540b40fd400da718704bb3be6603.pdf?index=true
    • https://s3.amazonaws.com/wutogugej/duginoso.pdf
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_67a32be6aebf406a9892c723c5b1f9f9.pdf?index=true
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_14ee7fb45443466f8a0cc1395cafeb69.pdf?index=true
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_c532da6aa1f344a3a5d773bb1b0bb6cc.pdf?index=true
    • https://s3.amazonaws.com/mukut/toyota_camry_hybrid_le_2020_for_sale.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_off0000ea9f.bin
6727077424c108f7fe1d682927bf9aca6a69f51476987c901121634b62f3e886		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 5536 bytes
font_01_sfnt_off0000fd4c.bin
c7b408df9822dd5b81361343fcbd401144023f7334d34b6fb685377e12ddd1d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4C 10132 bytes

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