Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd03d86ef99b82a…

MALICIOUS

PDF

77.1 KB Created: 2021-04-07 00:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 13fcd77a88ed3253ffac800133debc7c SHA-1: be55f1e1e9b66688adbb8a62179d546e0f422840 SHA-256: 1cd03d86ef99b82aa0fd1fbcbba390355508bdbcf71dd9f0f1f0bbf319235a77
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. It contains multiple external URIs, including one that appears to be a redirector with a search term, suggesting a phishing lure. The document body, though heavily obfuscated, contains text related to educational materials, reinforcing the lure. No scripts were extracted, but the presence of numerous URLs and the high confidence of detection suggest the primary goal is to redirect the user to a malicious site.

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://kuzutuzo.ru/strik?utm_term=mcgraw+hill+math+book+grade+5+answers PDF link annotation
    • http://sekujirimabasas.getenjoyment.net/how_do_you_become_a_real_estate_agent_in_nc.pdfIn PDF document text
    • http://susekilimu.medianewsonline.com/20645949471.pdfIn PDF document text
    • http://mebelintera.ru/37679635719pt3m0.pdfIn PDF document text
    • http://rolivazugatar.scienceontheweb.net/adobe_illustrator_course_syllabus.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/hamilton_beach_flexbrew_single_serve_coffee_maker_partskiwjc.pdfIn PDF document text
    • http://xomerisupudegop.medianewsonline.com/way_back_into_love_piano_sheet_music.pdfIn PDF document text
    • http://filanion.online/ranma_1_2_live_action_pelicula_completa_espaol6ajs3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vamavaremimot.atwebpages.com/33175898461.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/38400949949.pdfIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_dffbc5897d8e466198e255780cba0f1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/teamspeak_3_free_android_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be5d6f1-9740-40af-9eec-a536f6e98406/glass_sword_red_queen_series.pdfIn PDF document text
    • http://kimoviranonaf.onlinewebshop.net/robenisegepulekige.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/revexupelet.pdfIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_e79ae18f11614091aadcbefece211d9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/99c1ffd4-1374-41aa-a49c-8d90ac3c2c76/murray_riding_lawn_mower_fuel_filter.pdfIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_d78f67629fe944d9bbe2abd4ba324116.pdf?index=trueIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_6b839b07085d4ce4a03ed7754869fe2c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 5776 bytes
SHA-256: 398662bd2525f53953524fe7c2cf743c271eb223b0cd8f13856ad5716f38fd3d
font_01_sfnt_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 11152 bytes
SHA-256: 4b1e1fffd8ec59bf8d80f892ca2b8c361e7fc5b35be9557042564e973d8df8a3

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