Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b334c3ee937351…

MALICIOUS

PDF

111.4 KB Created: 2021-04-01 05:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66f693620f4ca30cbc5204d4a4479b3a SHA-1: 76c0f8e4d79e5bf27538675e9f48bc0be2475c29 SHA-256: 69b334c3ee9373516e8090726ecbac3529202c0172777967d310a87ee6ddefe0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=sample+letter+of+intent+for+nursing+school+admission
    • https://puwedogomep.weebly.com/uploads/1/3/1/3/131382223/5515405.pdf
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/8880348.pdf
    • http://obschee.xyz/kali_linux_hacking_tutorials_free_downloadmbout.pdf
    • https://dosabaret.weebly.com/uploads/1/3/4/8/134861273/5745907.pdf
    • http://gatorama.fun/lomimutexudodezominabif938g.pdf
    • http://wubujonil.getenjoyment.net/58732660634.pdf
    • https://lijimoxa.weebly.com/uploads/1/3/0/9/130969704/7637145.pdf
    • http://goldstein.capital/60714944783lljb4.pdf
    • http://xomunuxeju.sportsontheweb.net/sixoba.pdf
    • http://sufekuxuxujaw.iblogger.org/roduweju.pdf
    • https://pesowisigafu.weebly.com/uploads/1/3/0/7/130739627/durawikediwamabeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1e842a1c-6ed5-4cc7-a6bd-033ed31a2b26/wolimevixugiri.pdf
    • https://uploads.strikinglycdn.com/files/463d2e1e-4388-40b3-bac6-8e865c2ab464/12624949525.pdf
    • http://kivarutumo.myartsonline.com/77087518810.pdf
    • https://uploads.strikinglycdn.com/files/ecffb290-4503-43db-94f1-a579684d039d/tiranojogubob.pdf
    • https://uploads.strikinglycdn.com/files/09d754a2-b1f3-4022-a281-32848d91958d/how_long_is_15_months_and_27_days.pdf
    • http://jufakoxageponuz.rf.gd/abrsm_diploma_candidate_declaration_form.pdf
    • http://vomematomeze.epizy.com/365_days_of_keto_diet_recipes.pdf
    • https://uploads.strikinglycdn.com/files/b6a4a393-36a6-4a9e-b770-e1f8c91fdacc/instrument_used_to_measure_weight.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016b80.bin
dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B80 2828 bytes
font_01_sfnt_off0001757a.bin
4da90fd0da16c508edfa2d136510cbf238b36e12c63709c55ce44d92d2348845		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1757A 5672 bytes
font_02_sfnt_off00018894.bin
f395ca9b3b39546bb272a1b6a5b071d01c0d493f21e6bf1d66c04376ad07ff27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18894 11044 bytes

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