Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75675f6e4977bb7…

MALICIOUS

PDF

72.9 KB Created: 2021-04-20 04:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 097eb3418b9c30d40ecfd3588f7193e9 SHA-1: ee657c1077a3ecbbb7e206131cf501fd3e42d931 SHA-256: b75675f6e4977bb7f5b854319f4101fefc7e73936870de77d9ad1e611c7bb7b4
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. One prominent URL, https://ponafet.ru/strik?utm_term=smith+and+wesson+manufacture+date+by+serial+number, is presented in a context suggesting a search result, likely to trick users into visiting a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=smith+and+wesson+manufacture+date+by+serial+number PDF link annotation
    • http://edalovert.xyz/dicionario_ingles_portugues_cambridgepikb5.pdfIn PDF document text
    • http://nakaxovatixokew.22web.org/56430509519.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/hj41Wjb/65418873784.pdfIn PDF document text
    • http://persequen.com/how_to_learn_easy_englishds61e.pdfIn PDF document text
    • http://zutolewe.mywebcommunity.org/how_to_thread_bobbin_on_singer_simple.pdfIn PDF document text
    • http://hellesypakk.online/fovafokohy44d.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/symbolic_interactionism_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/pofifarim/egYjdQ7/vintage_apple_computer_wallpaper.pdfIn PDF document text
    • http://sun-italy.space/28169755201an77e.pdfIn PDF document text
    • http://teleporttur.ru/rojirutiladigekgsq92.pdfIn PDF document text
    • https://cdn.sqhk.co/dofubetu/ejjjcFc/29678117809.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/PjhZigR/fios_tv_app_apple_tv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zavulelobawabi.onlinewebshop.net/jesowevare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ee5500-f079-4130-913d-24e3ed382ddd/51819355411.pdfIn PDF document text
    • http://kavizerexu.rf.gd/xejiravifo.pdfIn PDF document text
    • http://kuxexulotubi.epizy.com/vavomanaxufonejisirizuku.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/kededonip.pdfIn PDF document text
    • http://mokodipixa.epizy.com/23811111782.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/77838614595.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/1119591044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae18946d-08c5-4761-bf35-85d506ca184e/how_to_tell_if_a_cop_car_is_undercover.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_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 5700 bytes
SHA-256: 77ac76de4d232264c90ff4ed56befc18f219f8283e82bba3b2e14d270b6ee75a
font_01_sfnt_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 10832 bytes
SHA-256: 723cff205bd017df440c0c429c77ba2e599f01ff000df3dd7ee8767cfeb326b5

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