Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26e81419979e646…

MALICIOUS

PDF

74.8 KB Created: 2021-03-01 18:00:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 7f63f1855bd357b391d68cdf780e8692 SHA-1: 4ab1927bc1974832482ec306ac0ceb8e461d7ccc SHA-256: f26e81419979e646626df11de77a2bd96d1a2e4a42db04c20de597b438d8ce22
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=anatomy+of+the+eye+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372074/normal_603a6b33b8929.pdfIn PDF document text
    • https://botakukejase.weebly.com/uploads/1/3/4/6/134610266/3c1de47d470840.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/fghrjeO/31615295158.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469863/normal_6001e1e712ecc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378410/normal_600180f6aec15.pdfIn PDF document text
    • https://luwuberukad.weebly.com/uploads/1/3/1/4/131409546/4761830.pdfIn PDF document text
    • https://cdn.sqhk.co/wexovezojab/3heTihi/destiny_s_child_survivor_album_download_zip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468537/normal_5feafc04bc117.pdfIn PDF document text
    • http://pedobetef.iblogger.org/fogopalawuwuru.pdfIn PDF document text
    • https://fokinovev.weebly.com/uploads/1/3/0/7/130775288/7ead5fd03.pdfIn PDF document text
    • https://zamikife.weebly.com/uploads/1/3/1/6/131606416/140346.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/hbFtt3I/ronore.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/igtYLRC/39863740816.pdfIn PDF document text
    • https://cdn.sqhk.co/vogidasobe/NXbZKgf/tap_counter_computer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407064/normal_6000a5ffa7e30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jalugegaru.epizy.com/17981391924.pdfIn PDF document text
    • http://gusutawidike.epizy.com/dilikavofipawutemar.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_off0000e9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DB 5220 bytes
SHA-256: 73f22d80897877814b519883c5c485525ed4a047c81c1f867d4b98bbc0921e19
font_01_sfnt_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 10056 bytes
SHA-256: f3e1bcc608ccbc150e67ac80287b32f431aaee8fefcc4024c257e8330022c164

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