Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b7f8997fbf1b4a…

MALICIOUS

PDF

65.7 KB Created: 2021-02-06 13:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 9eaa1b1fd0122b621cb122c56bc8cea5 SHA-1: dc4fda0cdf5f5d98a5229bafaadeed6374b7f75d SHA-256: d4b7f8997fbf1b4a13b183e60eb8225e11bdd74200eb1808777986b428809ebb
244 Risk Score

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://pumegamafe.weebly.com/uploads/1/3/4/4/134498449/5572185.pdf.
  • 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.
  • 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://yafferge.ru/wb?keyword=methods%20of%20communication%20worksheet In PDF document text
    • http://yognat.space/regim_alimentar_diabetb00v7.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/odu_ifa_obara_ikas97lm.pdfIn PDF document text
    • http://resufomuvojos.22web.org/bloody_roar_1_apk_for_android.pdfIn PDF document text
    • http://vofamewa.22web.org/album_gana_song_tamil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393515/normal_5fd0ed23797c3.pdfIn PDF document text
    • http://nature-ital.space/todifekaxozomawudepozudrigv.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/11109164966qkgfw.pdfIn PDF document text
    • http://topsalon.xyz/user_guide_icon_font_awesomedaakl.pdfIn PDF document text
    • https://cdn.sqhk.co/lagolipumepi/iivieWc/94680986048.pdfIn PDF document text
    • https://pumegamafe.weebly.com/uploads/1/3/4/4/134498449/5572185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405660/normal_5ffd2dd21c3c3.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvapipitol/BsXhcMt/80598153520.pdfIn PDF document text
    • http://hookup750.website/daddy_long_legs_spider_lifespanxjjfo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wawuzir.epizy.com/15042551745.pdfIn PDF document text
    • http://vudalulok.rf.gd/couple_game_mod_apk_unlock_all.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_off0000c2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AA 5392 bytes
SHA-256: 54c3b8121eec94339361d0dc9bb13b6a531c9352d0afe45ab9fdfd6e817e21fd
font_01_sfnt_off0000d4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 10896 bytes
SHA-256: c2da1d23df954f225a9124b8c30e0795a972df9b0b3e04bb3c7db55d14df32ca