Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdec8508764c7c8…

MALICIOUS

PDF

75.3 KB Created: 2021-03-09 19:23:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 77920ea0b7440b1822895743651346ba SHA-1: b819e7bfc384f0a36ebd6864e97d1c52c1b1dc63 SHA-256: dfdec8508764c7c8f8de67ac8e30243830df6df8b98cbec150997ad35541eba3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to host malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/aws?utm_term=is+bodyweight+training+good+for+weight+loss PDF link annotation
    • http://dvertsoff.ru/mecanica_vectorial_para_ingenieros_dinamica_9na_ediciondo3cw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484631/normal_60225a69e7237.pdfIn PDF document text
    • http://sreda.city/wupebasifebemr83ro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446283/normal_602a23dd2513c.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuwudedi/hclDhia/58227855461.pdfIn PDF document text
    • http://lakujalinifibo.mypressonline.com/french_story_books_for_beginners.pdfIn PDF document text
    • http://vazagitomis.mypressonline.com/7076922227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375200/normal_601abd281e6ea.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/how_to_use_food_scale_for_calories.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/jugoralodisodusipogikarurijd24.pdfIn PDF document text
    • https://cdn.sqhk.co/wibafozadil/gCH8Kji/pilexinu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447662/normal_5fed4620d0375.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/hbYvnQR/filelakenoxajibemon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gemovimuwopete.atwebpages.com/23252532657.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_f2fd40b9359345fd95c9ee08a58e63fd.pdf?index=trueIn PDF document text
    • http://wadoromutisagar.myartsonline.com/49910032617.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_755e24ebc37a465985ea82a928e91e3c.pdf?index=trueIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_a00065a06886441599f1cf31e1a7c454.pdf?index=trueIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/ford_focus_2009_owners_manual_uk.pdfIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_b278fdb8a5a14f71931290b0f2fcdafa.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 5228 bytes
SHA-256: d6ab4efb8909a750f57e131bcb30e40fe71195247db1d266009fe1bc87eaffd9
font_01_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 10232 bytes
SHA-256: e361e6252cb821f92d37a759438c2f34e46620d78b0d1f66ae305efae6ce0039
font_02_sfnt_off00011151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11151 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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