Malicious PDF — malware analysis report

Static analysis result for SHA-256 522f5fa2b7852a03…

MALICIOUS

PDF

74.6 KB Created: 2021-03-21 08:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 801b47a6728a5f9b9944c43b9a15d6c5 SHA-1: 7b076dfd566702f023a41cb62d591918a9072b9c SHA-256: 522f5fa2b7852a035b0b0042d8e7bcb7c852daaefa6c48b06316af7f353d6674
126 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, https://midufefew.ru/wix?keyword=gta+san+andreas+apk+indir+%2527%2527+apk+day%25C4%25B1, suggests a lure for game downloads, indicating a phishing or social engineering attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or lead to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://midufefew.ru/wix?keyword=gta+san+andreas+apk+indir+%2527%2527+apk+day%25C4%25B1 PDF link annotation
    • https://nevedaroxizewav.weebly.com/uploads/1/3/4/5/134592578/pomepa-jipotupo-xakimopubiloruj-vovesu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388421/normal_6002b9c6ef331.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/q6ifyi3/yandex_browser_mac_os_x_10._6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372682/normal_5ff2671d1a471.pdfIn PDF document text
    • http://towixowun.iblogger.org/annual_salary_certificate_format.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403410/normal_60026e8f98614.pdfIn PDF document text
    • http://viwimewi.22web.org/combined_gas_law_problems_and_answers.pdfIn PDF document text
    • https://gitumakiwu.weebly.com/uploads/1/3/1/4/131437138/c9241fc6.pdfIn PDF document text
    • https://karujuxu.weebly.com/uploads/1/3/4/7/134717714/vefanofef.pdfIn PDF document text
    • https://peramixirado.weebly.com/uploads/1/3/1/6/131637131/6687015.pdfIn PDF document text
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/vefaja.pdfIn PDF document text
    • https://cdn.sqhk.co/jalizovi/Aighf91/davalatutujif.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/iibUmUX/33139443086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488558/normal_6043336271623.pdfIn PDF document text
    • https://cdn.sqhk.co/wedowetaso/jhZ2MnV/67099671421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465125/normal_603b2b380619c.pdfIn PDF document text
    • https://cdn.sqhk.co/jigekuragige/jiaIjgl/thai_script_generator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/zuvutokefajagofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30131efa-2150-4385-8e2b-e0b31887c7a1/sherlock_holmes_books_other_authors.pdfIn PDF document text
    • http://zafokogilose.rf.gd/amscope_microscope_camera_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b9f3205-3c1c-43ac-8602-f67b4d803082/80381262702.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/61016778565.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/vejejigin.pdfIn PDF document text
    • http://tuzotulerijenej.rf.gd/lightning_returns_final_fantasy_xiii_quest_guide.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_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 5184 bytes
SHA-256: a4c58637f7dc0aa7f2b3efb03d5e5e8ce3d82777d3a16c88ee70abe6ead73bb3
font_01_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 11364 bytes
SHA-256: ff35dcd5f9f695790df3097c3102d93bb04abfd8dc181feab3d576b1e07f71d6