Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e5ec156ee0712b…

MALICIOUS

PDF

77.8 KB Created: 2021-03-30 22:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bbefb5fe12fe8bc19c0ed4c06a5b271f SHA-1: b4ba0894d81a554b183a7e40b1c276b238ea4ac7 SHA-256: a1e5ec156ee0712b670f0e46d8fa675f06242e593a5ce2791a0eeff2f80db240
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=movie+hd+apk+for+mi+tv+4a PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404497/normal_5feea8f253a60.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/ligVQbb/nudigaxijiguvifiz.pdfIn PDF document text
    • http://onlinetiser.website/munisipufr704z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403685/normal_6048dcbd95c63.pdfIn PDF document text
    • https://cdn.sqhk.co/padezeda/ajfJKvN/dumawopafapawogubaturul.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/0Fjbhio/81631181458.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/what_is_tone_and_mood_in_literaturewqdyk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374835/normal_6059ba6996378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447647/normal_5fda8f9b1e6c2.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/42220562631.pdfIn PDF document text
    • https://cdn.sqhk.co/vapatibu/Bxugjdq/bixurabilazerovotedoseva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_6056bbcbd10a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456998/normal_604971a026d2d.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/wiwiperinefutebesopa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417408/normal_5fe04a0c15928.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xekazaz.myartsonline.com/vuvodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f49b62e8-a7fe-450f-8d75-f13d7efa2bb9/mozusikivoxojonotizokuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e840f57e-ee0a-40bb-a178-1f1f166f5468/33479717560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d0f4a3-cc67-4316-869f-dd5da98cb050/nerafopilulidixogur.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 5288 bytes
SHA-256: a6dfb4e64f9ed3e8227493b10a089f5a64eb8383129ef709fbcc1dc179c62e50
font_01_sfnt_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 11188 bytes
SHA-256: cfc4af04a3f14f7fdd24523ab825301fe8239c3ccd29a09f2b3032cd4150878b
font_02_sfnt_off00011473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11473 16340 bytes
SHA-256: ee51351c9eb8c6a9dbff1bb743467f39bbaa64eee970481c040e8f02c1ffc4b8

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