Malicious PDF — malware analysis report

Static analysis result for SHA-256 043cafc6a567bd3b…

MALICIOUS

PDF

76.7 KB Created: 2021-02-26 14:50:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a8a2584184a2b27f496ba1548db60bcd SHA-1: 7b517da86c0dc8dcbbfb27f2d2e0df835cf1348b SHA-256: 043cafc6a567bd3bd485702e89fa1986be95196de5ea61d6a2bf8e177670670c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many of which point to potentially malicious or unknown domains, suggesting a link farm or phishing attempt. The primary URL, https://golowaki.ru/strik, is likely used to redirect users to a malicious site for further exploitation or credential harvesting.

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 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.
  • 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=soleus+window+air+conditioner+troubleshooting PDF link annotation
    • http://funogager.22web.org/jisubuk.pdfIn PDF document text
    • http://afracheat5.xyz/diwelimikusepozuvuwhzw8d.pdfIn PDF document text
    • http://zejadovota.iblogger.org/85271081427.pdfIn PDF document text
    • http://rutamijojiru.iblogger.org/navy_nec_codes_operations_specialist.pdfIn PDF document text
    • http://xupenoxerukaj.22web.org/kafifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_603572279dbe1.pdfIn PDF document text
    • https://fekodajitor.weebly.com/uploads/1/3/0/8/130874258/9887136.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/chevy_silverado_2015_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/postknight_guide_bonds.pdfIn PDF document text
    • http://tefuguwo.epizy.com/semejubewemu.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/blackpink_whistle_english_version.pdfIn PDF document text
    • http://vuzujalaj.epizy.com/redosonug.pdfIn PDF document text
    • http://mafekebokidodat.rf.gd/wetere.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/90825710354.pdfIn PDF document text
    • http://mafevela.rf.gd/algebra_nation_algebra_2_test_yourself_answers.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_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 5536 bytes
SHA-256: bf0b76a7fa14dd6422e08b1e8c360391fec9ef1c42320eb166f05b05a86e54b5
font_01_sfnt_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 10056 bytes
SHA-256: 56d5f65b45baf1eeb806471ffb5a341455e7809b80d36a7c33df1042784c9cd4

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