Malicious PDF — malware analysis report

Static analysis result for SHA-256 523ed7676f5ef6ac…

MALICIOUS

PDF

80.4 KB Created: 2021-04-19 18:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9fbccf5740c1038dac160514e0b12140 SHA-1: dae3f822d1c3cc5a2fca26e8ab5b52a142886e3f SHA-256: 523ed7676f5ef6acf605ae007db0d15cb9491b4c9c59e75dcc99b6e448118be1
186 Risk Score

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://xajibur.ru/strik?utm_term=which+element+do+all+living+things+contain PDF link annotation
    • http://pinenud.mygamesonline.org/gewumovawakeloto.pdfIn PDF document text
    • https://gobisenuginofaz.weebly.com/uploads/1/3/4/4/134490447/sumalosoxojuxil-repisote.pdfIn PDF document text
    • http://basvuruizleme.online/alcohol_en_la_familia06pxv.pdfIn PDF document text
    • http://novijixonusasu.mywebcommunity.org/the_difference_between_male_and_female_brains_youtube.pdfIn PDF document text
    • http://reduslim-italy.site/aire_acondicionado_portatil_carrefou1p1v0.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/GXPiiij/99057102532.pdfIn PDF document text
    • https://cdn.sqhk.co/xusawikorut/jdQhjgf/24244055476.pdfIn PDF document text
    • https://cdn.sqhk.co/fexiseme/jgjgf8H/coolmuster_android_assistant_for_mac_registration_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_605d7482b789e.pdfIn PDF document text
    • https://luredirimepopes.weebly.com/uploads/1/3/4/5/134590269/jimom-jevuwememe-guvuvivisi-wumamupubu.pdfIn PDF document text
    • https://cdn.sqhk.co/wowixepis/iHvVr72/dufezadajovisosatiraf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375351/normal_602de7d1b45cd.pdfIn PDF document text
    • http://golixudib.mypressonline.com/metro_2033_redux_librarian_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/jbibJs8/bollywood_ringtone_song_download_2019.pdfIn PDF document text
    • http://tuvosudokalidu.scienceontheweb.net/holy_anorexia_rudolph_bell.pdfIn PDF document text
    • https://cdn.sqhk.co/xusozapovu/LkLjgjb/77220699420.pdfIn PDF document text
    • https://cdn.sqhk.co/pobefozo/919AhjJ/sling_style_tennis_bag.pdfIn PDF document text
    • https://zatuduxe.weebly.com/uploads/1/3/4/5/134595584/f8129.pdfIn PDF document text
    • https://cdn.sqhk.co/genedofe/JuOhege/candy_crush_mod_apk_onhax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/9558857652.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_off0000fc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 5328 bytes
SHA-256: e031caa32b2d2a98c3f0083851fd729cd7096951d941d80baae25bdc58adec47
font_01_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 11168 bytes
SHA-256: ab0b78c669e15be16c8385eb056fcacfb0294eb93102236409fce73cc83b58e9