Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae41e5643afdd54…

MALICIOUS

PDF

74.1 KB Created: 2021-06-08 03:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 04dc8af591281f1cccac74d94589decb SHA-1: cd05a9427eca5084ab90e546a8a71569ff2f3cb4 SHA-256: 0ae41e5643afdd545e9fb66073cbd94fcc973ff5c4eb513c3681c42a8c4960a4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one particularly suspicious URL pointing to a domain associated with phishing. The document body, though heavily obfuscated, suggests a lure related to a worksheet, aligning with phishing or malware distribution tactics. No scripts were extracted, but the presence of external links strongly suggests the document is designed to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://druttle.ru/123?utm_term=who%2527+s+vs+whose+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4482848/normal_60b1c2fae8a50.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4467593/normal_60b5aacb2239b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373985/normal_605c730cdbdc8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sekodegaxex.pbworks.com/f/16816677290.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144616989/disama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a628c532-8b66-4af1-a62d-e3ddc2c1a894/how_many_carbs_in_a_taco_bell_toasted_cheddar_chalupa.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/w/file/fetch/144464235/88630399596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e40de6-1c05-43de-b2eb-850e77ced680/jubapij.pdfIn PDF document text
    • http://jotoxipigi.pbworks.com/w/file/fetch/144696825/totufaledatorus.pdfIn PDF document text
    • http://wabiwepakeg.pbworks.com/w/file/fetch/144708615/jusal.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/w/file/fetch/144580320/transferencia_de_calor_por_radiacion_concepto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a80f087b-972b-445a-bc4b-e00cf6add018/masitexis.pdfIn PDF document text
    • http://jananevava.pbworks.com/f/principles_of_geotechnical_engineering_braja_das.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/nafibefived.pdfIn PDF document text
    • http://bowawesup.pbworks.com/f/11360212249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaa57c21-c4e3-48d0-af48-6309b8010bb0/g-shock_rangeman_gw-9400-1dr.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/nifanesivurabago.pdfIn PDF document text
    • http://wejojixi.pbworks.com/w/file/fetch/144672267/zonegef.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_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 5152 bytes
SHA-256: aca71990c98caade3b403f83069718df2f3d700aa5d37d572fcb551d66769aa7
font_01_sfnt_off0000f73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 10500 bytes
SHA-256: c25f4516e4c04ee8e93c1368deccec14ee751a80083743fc3a1749050b3ac9b6

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