Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fbff8839f012b5…

MALICIOUS

PDF

75.0 KB Created: 2021-05-21 13:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: da07dd9e4e8b56e1644c11691e156245 SHA-1: e7811f5b5ecfb47d3ddce3d9d12fc02848d5b3e5 SHA-256: b5fbff8839f012b58bc88e1487fe77a411585a6cc93ac39987c65d9572f67413
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing lure impersonating Apple. It contains multiple embedded URLs, including one pointing to zajinet.ru, which is likely part of a credential harvesting operation. The document body, though partially obfuscated, suggests a lure related to iPhone hard resets to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/gofabanugobekex.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.
  • 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://zajinet.ru/strik?utm_term=how+to+make+a+hard+reset+on+iphone+x PDF link annotation
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/gofabanugobekex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456996/normal_5fc86ef42087a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387931/normal_603a69d59de48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_605a65b2d471e.pdfIn PDF document text
    • https://pofimutazotoxo.weebly.com/uploads/1/3/4/0/134000188/bawamuletaxum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366331/normal_5fe2ae50e3ed8.pdfIn PDF document text
    • https://wanuzixa.weebly.com/uploads/1/3/1/4/131482886/2445172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_606da96dc219b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446774/normal_5fdcf49ff2a6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476126/normal_603264681d2ea.pdfIn PDF document text
    • https://felilediwifagid.weebly.com/uploads/1/3/1/4/131453780/nulozopuboredi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_606e1e701f756.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/mosapavo_mawizikanusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470821/normal_601836f761f0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486987/normal_605d75a28f0aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502268/normal_5ff6910b18d91.pdfIn PDF document text
    • https://tepadomuxufebe.weebly.com/uploads/1/3/1/3/131382092/4419ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2394998c-8e42-41fa-8677-650f5c5fcc10/wokajanimafolifud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8efd4c83-2177-44d6-be06-d0a4f5d0befa/gexumobarenadixazibexit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6428d0c-1079-4a60-9af3-5a93270c2e1a/udf_formatini_ama.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_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 5352 bytes
SHA-256: 00be4acc08dc58555db520426ed6a38ff70f59d2ac64531d0441d270c9e91e42
font_01_sfnt_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 11344 bytes
SHA-256: 04ba0a05178152a98f13d55eb17acdf1eb75026d45fc20e72b02443819f2c576