Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d1e5f58f80db84…

MALICIOUS

PDF

87.8 KB Created: 2021-03-16 01:49:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e2f84346b5b98fd3740f4bf479ffe24a SHA-1: a91e02e9b5cc024f5dd93a30d24cd4a5f3e8fb82 SHA-256: c9d1e5f58f80db84f5a4a5ceb129bfcae1a476ec76a67a04563a5a88892ebe17
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to an exam preparation guide, which serves as a lure to encourage users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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://botokaw.ru/wix?keyword=leed+green+associate+exam+preparation+guide+v4 PDF link annotation
    • http://sonabalule.iblogger.org/vedenemamumibuj.pdfIn PDF document text
    • https://cdn.sqhk.co/jasorevujoxu/RBiwtuh/massive_mimo_beamforming_antenna.pdfIn PDF document text
    • https://cdn.sqhk.co/jefigujaxev/i7aUKz8/cheat_cafeland_android_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/gmjbihB/52272387315.pdfIn PDF document text
    • http://bimelar.22web.org/installing_and_configuring_windows_10_exam_70-698.pdfIn PDF document text
    • https://cdn.sqhk.co/gilisuvunu/ygijfjc/ffxiv_bard_macro_performance.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/depression_questionnaire.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/KaXvjd5/find_my_friends_app_for_android_and_iphone.pdfIn PDF document text
    • http://nukapag.getenjoyment.net/what_is_the_pact_book_about.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/Ogcgijd/table_top_racing_world_tour_nitro_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/fIhgcjh/anime_doll_maker_games_free_online.pdfIn PDF document text
    • http://tijukilebag.getenjoyment.net/lumajelaban.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kopuperoki.epizy.com/32233213873.pdfIn PDF document text
    • http://sezesub.epizy.com/basuvulisure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da82dc05-8d63-46ce-852b-a12bbab201ec/gizavurapukunavu.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_a61e8f09647241b0bebac45ffe716793.pdf?index=trueIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_38efb054065d4e76bf15017571ab14ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ef35eb-dbd2-494c-8000-1a5b98b7e3ef/narokoburosepunomijagibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/201652dd-c0ab-43ea-98ea-0a09b85e01c0/the_bet_by_anton_chekhov_summary_in_hindi.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_14a0cccfa3ae4439a20e2d641256f393.pdf?index=trueIn PDF document text
    • http://felepav.epizy.com/fukolapuvulalaxinabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef79118-e132-44bb-b2a5-9eadc4f30183/does_powerade_have_calories.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10932 5400 bytes
SHA-256: 968d9e302d0f0339edc3e81969c3cad7273950ceb21f2d2017584f3ac3df59d1
font_01_sfnt_off00011b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 11804 bytes
SHA-256: 73f0791e9f334ebf586464942ebc606f6bd58e1b9f4209f74f8036c91967aecb
font_02_sfnt_off00014377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14377 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3