Malicious PDF — malware analysis report

Static analysis result for SHA-256 a246290f7305a34b…

MALICIOUS

PDF

73.9 KB Created: 2021-05-29 05:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 61ae57d4b0de4645ad0306cdad5d03a4 SHA-1: 1f79e4cbbc8d814c3f347f811406e294cd31a4dc SHA-256: a246290f7305a34b70ea4cbfd19138a29c32ed32c1eee6121342ea0f2f724695
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://nipisod.ru/123?utm_term=free+antivirus+with+licence+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403120/normal_6025b5ac08e6d.pdfIn PDF document text
    • https://sifofazawovetix.weebly.com/uploads/1/3/0/7/130776166/putupuxawaxeju.pdfIn PDF document text
    • https://rubuvewoxuvima.weebly.com/uploads/1/3/4/8/134873715/niboligaxedokabika.pdfIn PDF document text
    • https://fizolapojola.weebly.com/uploads/1/3/1/3/131383549/pijitefuwiginavawim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463264/normal_6027ad6b3536e.pdfIn PDF document text
    • https://nekazexupogufeg.weebly.com/uploads/1/3/1/4/131454238/1352e8a33b968.pdfIn PDF document text
    • https://vetexugosopaviz.weebly.com/uploads/1/3/0/7/130738505/rutud.pdfIn PDF document text
    • https://dabelebixoxo.weebly.com/uploads/1/3/5/3/135310161/kuwufokire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451750/normal_5fd9ad751133b.pdfIn PDF document text
    • https://jazafojof.weebly.com/uploads/1/3/4/3/134310209/zaladonelegumumaxu.pdfIn PDF document text
    • https://nefosedinipal.weebly.com/uploads/1/3/4/6/134698739/dedamalusu_rorugaf_jufuxixud_zubalab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454424/normal_5fd267ffc2faa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418391/normal_6005975608709.pdfIn PDF document text
    • https://tazififodokufu.weebly.com/uploads/1/3/0/7/130776891/2100de4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422163/normal_606a5e7763ce0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c34df4-2a12-4d57-99a1-33771b5fd0fb/naruto_shippuden_ultimate_ninja_storm_trilogy_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4034a46-ef65-4c7b-9c82-a135dd9151d9/sony_bravia_kdl32wd754bu_smart_32_led_tv_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50af1570-6da4-4c66-ab9b-5994168d2985/xovoxigiwunilive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed8df83-02bf-4ca5-b508-45c65a8ace92/8798573839.pdfIn 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_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 5160 bytes
SHA-256: 4a6fb26b9fbd99807320a9990ef58f3de898f071f64a9785bb1fb7a389cf2dee
font_01_sfnt_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 10632 bytes
SHA-256: ff1bd4703ae57e275417415ed3422c2bfa52150f32cd9fe129978968a5574bc7

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