Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d45da0815d7db83…

MALICIOUS

PDF

74.1 KB Created: 2021-03-02 20:41:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7ab9d4fc5a0570e1e8a41d922503627e SHA-1: 9da4d50549c280922db8ba455de245b3519bf198 SHA-256: 4d45da0815d7db83668795514e7ce689fe64ae6f357c3c04de2edaec1e903d04
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary suspicious URL pointing to 'fokemale.ru'. Heuristics indicate the PDF is a link farm hosted on disposable domains, and ML classifiers and ClamAV strongly flag it as malicious. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/award?keyword=sistema+muscular+humano+para+ni%25C3%25B1os PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417653/normal_603e3f18a9eab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368951/normal_5ffc6a1372ea6.pdfIn PDF document text
    • https://dujibirarikow.weebly.com/uploads/1/3/4/3/134321406/bawutafup_tisagagaxi_roteledopatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494436/normal_600ccb0335b2e.pdfIn PDF document text
    • http://wamawogep.iblogger.org/critical_care_patient_transport_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/gfhhNV3/wovipinarojiduvekatot.pdfIn PDF document text
    • https://mazazujusuvazix.weebly.com/uploads/1/3/1/8/131856432/vemurakudumeleb-zenaza.pdfIn PDF document text
    • http://wobixoka.66ghz.com/vubonusosagekaxaf.pdfIn PDF document text
    • http://magowowir.iblogger.org/chal_chaiyya_chaiyya_remix_song.pdfIn PDF document text
    • https://tuxuboninivufos.weebly.com/uploads/1/3/4/4/134478209/a8e5465671.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/murudute/94858451776.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/true_caller_app_for_android_phone.pdfIn PDF document text
    • http://mevonaku.rf.gd/samsung_s8_android_9_dark_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/xopusikezuzuzidonadigix.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_off0000e3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 5488 bytes
SHA-256: 3cd1a9b442896e406708961de3fa1cd8fade7440c96cd4b2a136840fa87746f0
font_01_sfnt_off0000f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 10884 bytes
SHA-256: 32af9c607755c441b0e6df961b37f57d56e6cb3bfebad12e31b946953c68f723

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