Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c18079e6833137…

MALICIOUS

PDF

72.4 KB Created: 2021-02-12 07:12:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ce7a0b9eda1cc172db0bb21a3a884ec6 SHA-1: dd8811cc5be1b330a3ca0ddb42887962ccecd4c3 SHA-256: 03c18079e6833137050fc39ae305de33071697ab2f361bc1cd7b10df77c9d2d5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/123?utm_term=tail+light+bulb+socket PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499283/normal_5fd2f2d2d2ff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_601b7497bcb87.pdfIn PDF document text
    • http://xeeewq.xyz/dozuwagavosazakobakevis2r0wc.pdfIn PDF document text
    • http://aromaita.space/dewugovoxeter8b6u6.pdfIn PDF document text
    • http://coupons2020.info/75738738427lqc5z.pdfIn PDF document text
    • http://zedukibawubige.22web.org/happy_birthday_background_templates_free.pdfIn PDF document text
    • http://kraftmann.su/nagimefuvojabedobodififeeuamr.pdfIn PDF document text
    • http://save50.pro/reynolds_cookie_baking_sheets_parchment_paperhw1z9.pdfIn PDF document text
    • http://nigasheff.xyz/among_us_notepad_onlineb2tja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496816/normal_5fe66be5ed50a.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/6583079671a8gvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409236/normal_5fed21a9a59ba.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://jopubulebava.rf.gd/sejebudigawixosifataxuv.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/xugoremuwuzidiw.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/autotune_vst_for_fl_studio.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD323 4896 bytes
SHA-256: 5c4fb9454a81b851b15ec60553e05b1c1dda79c8cbe8d4d628dc2b92e51f0fc7
font_01_sfnt_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 10032 bytes
SHA-256: 05f645f98d726f6b22249ced474b389c54ea48b2c5bf52e1f83fa3393b127eb0
font_02_sfnt_off0001063e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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