Malicious PDF — malware analysis report

Static analysis result for SHA-256 688536550a6109e8…

MALICIOUS

PDF

76.4 KB Created: 2021-04-02 02:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 776e2708764afcb9ad6f6496590b4d15 SHA-1: 3321321cdc3f55fd2b9df5d97f27887af989b385 SHA-256: 688536550a6109e8268022f524329eb747917add9a21c8d9f7cd16001dbe4849
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, with one specifically pointing to 'ponafet.ru', suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=nikon+l35af+ebay PDF link annotation
    • http://luwogexejel.getenjoyment.net/what_does_captivity_mean_synonym.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5fdbc25e425e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479460/normal_601baeb64078b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466996/normal_5fe4ba0e09916.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414335/normal_6004fa22d7d2b.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/clasificacion_de_los_animales.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/arithmetic_math_tricks.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481058/normal_5fc5715785ca1.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/apoptosis_lecture_notes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379230/normal_6006a0db4223e.pdfIn PDF document text
    • http://wepiriv.22web.org/41018407310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422135/normal_60664ade94e12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488090/normal_605faa9801c42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1d4f555-1eac-4d61-aa83-27206cf3ee4b.filesusr.com/ugd/1706f5_1958175f241049ddb66edc83c6f42351.pdf?index=trueIn PDF document text
    • http://kivekedifewu.rf.gd/bexumevimosag.pdfIn PDF document text
    • http://midexudotag.epizy.com/jajimejip.pdfIn PDF document text
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_c419e13c36b44943a44736b25d9e6543.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_f3d9ab7e110d445fbbeae6e49d43f0a5.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_345f19b05866468b9d4e0a3090448427.pdf?index=trueIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_bd1109bc8ddb4a58b56738b6ebe1400a.pdf?index=trueIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_4a2de75e3cef43ea8b95c8e38ca79b07.pdf?index=trueIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_1a2b686095414a92b59d4bae6b44fd78.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_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 5052 bytes
SHA-256: d82a352b0ea0ad010bd34888370d8c26eae8bf05d65868e624083de6752b32c6
font_01_sfnt_off0000ff73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 10980 bytes
SHA-256: c0f2f0cc1146b45335f63efe22892ef61597e561161247b5d69b02f8dff677ae

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