Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f39aaf54ffbaa86…

MALICIOUS

PDF

77.3 KB Created: 2021-04-17 17:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 745446bc9b354708ce1f1ac41a17b415 SHA-1: af1e4c8d06345713d89fd24e67e9dd77d50b0c7b SHA-256: 5f39aaf54ffbaa86618815f603e7f3f25edafe175bba3ad1232aaf73e7b3bfd5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. The primary URL, 'https://golowaki.ru/strik?utm_term=skil+15-amp+7-1%252F4-in+corded+circular+saw+review', is presented in a way that suggests a lure, possibly for phishing or to download further malicious content. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0'. No scripts were extracted, but the structure and URL usage strongly indicate a malicious intent.

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://golowaki.ru/strik?utm_term=skil+15-amp+7-1%252F4-in+corded+circular+saw+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393637/normal_600c7f1837554.pdfIn PDF document text
    • http://cetapp.xyz/660957486369jz6v.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/ikl1jiZ/ice_cream_challenge_free_match_3_game.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/iBijgKb/good_keyboard_for_android_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481515/normal_60244ad4f367e.pdfIn PDF document text
    • https://miwebuzoz.weebly.com/uploads/1/3/4/0/134095964/batozutobogafoxoka.pdfIn PDF document text
    • http://lnstagrambusiness.com/caminito_del_rey_mapaoe058.pdfIn PDF document text
    • https://fosijegaden.weebly.com/uploads/1/3/4/8/134868146/b26e788390f59.pdfIn PDF document text
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/05bdbda.pdfIn PDF document text
    • https://cdn.sqhk.co/sotogademo/vji2hdT/mexidemenopuzamomanefedi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_602253648394e.pdfIn PDF document text
    • http://goloszauniver.fun/kiboboz9aj7.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://risozipenolifiz.rf.gd/how_to_expand_binomial_theorem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/538f584e-f720-48f7-b0e1-c5e22cf28ac2/99539810839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8abc3570-7d1c-4982-8c9e-fbbebecb06ba/sufabifelanatoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/853a44ca-8f7e-4711-b82a-814fb27c4bed/paige_spiranac_golf_tips.pdfIn PDF document text
    • http://texagofudadeket.epizy.com/mukewetufutibosasosedisox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40007ec7-56fb-4062-bec6-edaf66a7868c/7424224647.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_off0000e1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D3 5752 bytes
SHA-256: b2d2debe48e8f36185bf4e47b5da166567b19357e025807ae2eb6d8404a4e44b
font_01_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 10596 bytes
SHA-256: 7d0ef80869aa74ffde8dd3a2c88c6f1d72a2e3a73b2ef8b4d885d83770f37e6b
font_02_sfnt_off00011994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11994 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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