Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab410011d9a9cb31…

MALICIOUS

PDF

77.7 KB Created: 2021-03-15 07:22:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 11a2f824cde813708b6d6c77f8f0cda4 SHA-1: 8d2b3d326512cbc505fe7e340b9958443c5dadd6 SHA-256: ab410011d9a9cb31394eb08cd205867d8d56e7e6d119bceeedf60cd16ad376bf
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The document impersonates Microsoft and contains a link to a suspicious domain, 'resalured.ru', which is likely intended to steal user credentials. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a credential phishing attack.

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
  • Brand-impersonation credential phishing lure high 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: call-to-action link host does not match the impersonated brand: https://resalured.ru/strik?utm_term=big+world+fix+packs.
  • 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://resalured.ru/strik?utm_term=big+world+fix+packs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382614/normal_60273f0506770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413011/normal_6031e73e39a98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392647/normal_603125b164769.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_324bfdb1043442469e14a950a114ca84.pdf?index=trueIn PDF document text
    • http://kulagotano.rf.gd/samsung_printer_c480fw_imaging_unit.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/93778053902.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/il_giorno_piano_sheet_music.pdfIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_d50fdeffb3554d478a72874fa3e8587f.pdf?index=trueIn PDF document text
    • http://gafawazela.epizy.com/airlift_full_movie_hd_worldfree4u.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af7ad72-707e-4817-a143-eae4fc850147/19912990528.pdfIn PDF document text
    • http://supetok.rf.gd/pugaboropi.pdfIn PDF document text
    • http://gijifosunusu.epizy.com/agent_bhairava_movie_ringtones.pdfIn PDF document text
    • http://wudumiwetoveri.rf.gd/the_way_of_kings_book_1.pdfIn PDF document text
    • http://lotawom.rf.gd/44637518021.pdfIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_9177633012374576b9716110b252e5d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3acb8c12-fc5c-4e8d-ab6a-aff1858005b6/tadamobimar.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/76910699410.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_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 5596 bytes
SHA-256: 53f7caa7e958e013c8b63b097833edf51dacad5ada1a5b9bca74338373ff6d73
font_01_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 12220 bytes
SHA-256: f4ebc7a51f4b4c54f2b79882afdf49e490294049835c0e507d666ad10ba332c1

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