Malicious PDF — malware analysis report

Static analysis result for SHA-256 104bf2a31817d89e…

MALICIOUS

PDF

83.4 KB Created: 2021-06-07 14:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2b8d574f963b026e0e835048ccff3bba SHA-1: 847ddf270564bdbd22571eede9c75a2a58c23108 SHA-256: 104bf2a31817d89e8063b66fb4293791fcf6bfe115166afdcc49c3106a589b0d
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 as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to disposable hosting and are structured with UTM parameters, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm designed for deceptive purposes.

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://krisoc.ru/pbw?utm_term=cambridge+flyers+exam+sample+papers+pdf PDF link annotation
    • https://nofokupefuw.weebly.com/uploads/1/3/4/6/134695722/pelutinajaba-sitanepuj-jirelinagegu-padopibobep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410186/normal_60063f11553ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417999/normal_60011e741a8a5.pdfIn PDF document text
    • https://nalakipivexovob.weebly.com/uploads/1/3/4/3/134385055/2724908.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417208/normal_5feef1f366ae6.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4487192/normal_60b6ec0f96a80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417414/normal_600f95e4dfde7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469836/normal_5ff91036eb5df.pdfIn PDF document text
    • https://napifilimikap.weebly.com/uploads/1/3/1/6/131606974/2750296.pdfIn PDF document text
    • https://napujokid.weebly.com/uploads/1/3/5/3/135339673/a3b129e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/675f13a6-b63e-4bbf-a95a-0a9a25924f78/78417879485.pdfIn PDF document text
    • http://pafunanukexe.pbworks.com/w/file/fetch/144583845/kabir_singh_full_movie_watch_online_hdfriday.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/144574461/how_to_do_a_mario_kart_tournament.pdfIn PDF document text
    • http://nefusim.pbworks.com/w/file/fetch/144625464/budinol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b826597-2fa2-44f9-a83c-6f0eaf4d8cc1/72089588637.pdfIn PDF document text
    • http://rasovuxosew.pbworks.com/w/file/fetch/144587730/ocean_tides_gizmo_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/183d692b-5fdd-433e-8efc-46e754a4ccc8/rinegogolewododasuban.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5b1497f-d315-4444-bbf0-07356a8b3f89/fractal_fx8_vs_helix_hx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb1f1e6f-1494-48ab-acf0-d3d6f421555b/resavutelukuverupixatelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c67a50ca-8e08-40c2-a95b-99f6df2125cc/46863728524.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_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 5576 bytes
SHA-256: 0bb394af1fe8aa7d1acd7e8f1eca7e1196013ff77f336ebeb33469d677b9f8ba
font_01_sfnt_off00011084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11084 17176 bytes
SHA-256: 15b87fa1ed7bc4d397cf72f54db5b8e6fc429b6bfbda5c9a7012a18336188b8b

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