Malicious PDF — malware analysis report

Static analysis result for SHA-256 5829c7a9186530e1…

MALICIOUS

PDF

84.3 KB Created: 2021-03-04 08:38:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58c01d1510ab2d9c58c03c8723603f6e SHA-1: 19ed9d414ac6016b8170f9d09f68726d602df50a SHA-256: 5829c7a9186530e1d995b554e54d3694622e4277b872b3191ff556fe40e8da6b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document exhibits characteristics of a phishing or malicious lure, as indicated by the 'Fake CAPTCHA' heuristic and the presence of numerous external links, many of which are part of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious websites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://jacksth.ru/wix?keyword=padi+open+water+test+questions+and+answers
    • http://mepadideboga.22web.org/whats_a_1003_form.pdf
    • https://cdn.sqhk.co/vaxarogajib/gz8x701/tafipewuvogeva.pdf
    • https://cdn.sqhk.co/rivitovolu/Qgdjcij/amazon_jungle_full_hd_wallpaper.pdf
    • https://cdn.sqhk.co/lomekojop/eVgg4k1/xazilibejigida.pdf
    • http://sexapixir.22web.org/caution_sign_template_microsoft_word.pdf
    • https://cdn.sqhk.co/wosipuvetot/gcN60sY/bewawakinimuf.pdf
    • https://cdn.sqhk.co/vakusukereju/iSdSDNh/gakadasewapemonukigod.pdf
    • https://cdn.sqhk.co/sokodajep/dgcGjeY/wotabot.pdf
    • https://fekujize.weebly.com/uploads/1/3/4/8/134869517/7371705.pdf
    • https://cdn.sqhk.co/lorakerasima/jhhgigi/lg_xboom_go_pl2_price_philippines.pdf
    • https://cdn.sqhk.co/kuniremolu/KHghgfA/26144143205.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wulimazef.epizy.com/how_to_get_freelance_writing_jobs_with_no_experience.pdf
    • http://pefegazafil.epizy.com/17123100167.pdf
    • http://zetinemimofoti.epizy.com/what_is_the_allowable_bending_stress_of_steel.pdf
    • http://tinatuvarisofat.epizy.com/update_my_instagram_for_android.pdf
    • http://fobuzepiru.epizy.com/35892983983.pdf
    • http://xegiseko.epizy.com/busted_halo_confession_guide.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_off00010eed.bin
a276e15dca40ffb96f4b2cf9f67639ec821621582d603d098686d6bb89911865		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 5140 bytes
font_01_sfnt_off00012084.bin
b3dce4e5a4ef28b47abac93d4f231214acde9ff338685bc7fe55a916bd1bc929		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 10300 bytes

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