Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbbf929322fbfef…

MALICIOUS

PDF

85.4 KB Created: 2021-04-02 16:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b50e6f57aeb0491bc64738d13c2a8890 SHA-1: 2f0d87e3f0ed64a2d960075bf76f7cd2547f5fb8 SHA-256: bdbbf929322fbfefbc703232e1e6907723a0e51ef99946ba48f9f15ad8a61e11
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One of the primary external URIs points to 'https://golowaki.ru/123?utm_term=short+personality+quiz+pdf', suggesting a lure related to a personality quiz. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=short+personality+quiz+pdf
    • http://plafond.xyz/convert_kindle_ebook_to_mac6356m.pdf
    • https://cdn.sqhk.co/susojitigi/3tIXhf4/86310195617.pdf
    • https://cdn.sqhk.co/fimirexuf/idictge/ghost_files_the_face_of_guilt_free_download.pdf
    • https://cdn.sqhk.co/nomitusibop/5IlzXie/zemujovuxilik.pdf
    • https://cdn.sqhk.co/xisalaximel/jfijXhd/motorola_flip_phones_at_walmart.pdf
    • http://lamozutejune.22web.org/geduzabuwetupimikurejabef.pdf
    • https://cdn.sqhk.co/tosobulig/XwLJlgf/8130314581.pdf
    • http://shlifovka-pol.website/kafimowazrqh.pdf
    • http://fufetaka.iblogger.org/what_is_the_best_front_load_washer_and_dryer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vunodakurawofo.rf.gd/29161522092.pdf
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_4494164d0bba42ebb4e679a9950d51fb.pdf?index=true
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_96a8b4527dd84c78b17360bdc825d4f2.pdf?index=true
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_35497e9dc10940c78be2f075cef7151c.pdf?index=true
    • http://lixanixuzuki.rf.gd/template_lucu_powerpoint_2007.pdf
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_73cc95160ea142d9aa4b6ef41e220d6f.pdf?index=true
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_4396bba042874e6aa661f913560a91b7.pdf?index=true
    • http://sukidagijonola.rf.gd/belukeropajulosegowujez.pdf
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_cb069b8148ad4a37b15dc1212e706c9e.pdf?index=true
    • https://e42ce0b3-f376-4cb5-9abe-507fdbb9570c.filesusr.com/ugd/603474_77984d04e4c44253a8406dc016917396.pdf?index=true
    • http://silimefepil.rf.gd/food_chain_worksheets_5th_grade.pdf
    • http://wolodavufaxus.rf.gd/macos_high_sierra_app_store.pdf
    • http://fororegovaje.rf.gd/modern_algebra_herstein.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_off00010ff5.bin
a96c3e4a78cca38394e83330dd6fb8d34104703a9ae97bebfc06054e2d5ad061		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 5508 bytes
font_01_sfnt_off000122b3.bin
82fad93d3291d1aaadeba7e22784093ad9b54aee654347b986b4344ba62cf94e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122B3 11008 bytes

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