Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ecae1ffca382fe…

MALICIOUS

PDF

88.9 KB Created: 2021-01-22 01:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 75a0fda024d42beb99bcf9e2dee1eb2c SHA-1: da42e2e6c8acb784bb53952e2846322f65bb91e6 SHA-256: 20ecae1ffca382feecfddae83d50ca0da6a0fcc8272dc1d40571dc3fa17860be
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of embedded URLs and the PDF structure point towards an attempt to direct users to potentially harmful external content.

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://traffset.ru/123?utm_term=cloak+of+resistance+dnd+3.5 PDF link annotation
    • https://site-1176931.mozfiles.com/files/1176931/xivetokaboturufolokum.pdfIn PDF document text
    • https://site-1172792.mozfiles.com/files/1172792/adeste_fideles_spartito_coro_4_voci.pdfIn PDF document text
    • https://site-1085087.mozfiles.com/files/1085087/rebirthing_therapy_video.pdfIn PDF document text
    • https://site-1177423.mozfiles.com/files/1177423/krabat_film_download.pdfIn PDF document text
    • https://site-1178370.mozfiles.com/files/1178370/petalesutulobagu.pdfIn PDF document text
    • https://site-1168144.mozfiles.com/files/1168144/cyber_monday_beard_trimmer_deals.pdfIn PDF document text
    • https://site-1177680.mozfiles.com/files/1177680/fovefazebunov.pdfIn PDF document text
    • https://site-1168251.mozfiles.com/files/1168251/sabado_gigante_host.pdfIn PDF document text
    • https://site-1232793.mozfiles.com/files/1232793/74701413210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483072/normal_5fe9adb4780c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501810/normal_5fc8a46cccb7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vofiwevo.epizy.com/colorado_statutory_warranty_deed_form.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_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 5304 bytes
SHA-256: fb884ff1400bb3fc3df033c5e04beab2f2c4930af6d0cd0bcd2526904e79234b
font_01_sfnt_off00013277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13277 10700 bytes
SHA-256: 6110a5c3127eef41a1ae4691e2024bd37edd35e9dea65a316a622efc415a628f

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