Malicious PDF — malware analysis report

Static analysis result for SHA-256 971ff77b93eeaee4…

MALICIOUS

PDF

79.5 KB Created: 2021-04-07 16:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48cd9ab731279c011e6a39371803eb38 SHA-1: 50d1e4249fed552428bcb1423e13d45224f1ce99 SHA-256: 971ff77b93eeaee43d2cde6176468930094da267d477e5a9446149cc8472bec3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a large number of external links, many of which are dynamically generated, suggesting a link farm or SEO spamming operation. The primary URL, 'https://golowaki.ru/wix?keyword=turbotax+coupon+code+2020', is presented as a Turbotax coupon, indicating a deceptive social engineering tactic to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=turbotax+coupon+code+2020
    • https://cdn.sqhk.co/jopolemuge/BQicj6f/cleaning_calendar_template_excel.pdf
    • https://cdn-cms.f-static.net/uploads/4381541/normal_603e7cffc12c5.pdf
    • https://cdn.sqhk.co/dusawugivepo/VhiMigh/6508296161.pdf
    • https://cdn-cms.f-static.net/uploads/4529977/normal_60265dd1a2751.pdf
    • https://cdn-cms.f-static.net/uploads/4465259/normal_60352fb035087.pdf
    • https://static.s123-cdn-static.com/uploads/4369179/normal_5ff46ea6750af.pdf
    • https://static.s123-cdn-static.com/uploads/4472773/normal_600483733f21a.pdf
    • https://static.s123-cdn-static.com/uploads/4417535/normal_5ff224d5659c5.pdf
    • https://safubijob.weebly.com/uploads/1/3/2/6/132682970/1011518.pdf
    • https://cdn-cms.f-static.net/uploads/4366337/normal_603fb0a6c9240.pdf
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/wijisivawojob_bironume_nufosekemiru.pdf
    • https://static.s123-cdn-static.com/uploads/4370555/normal_5fdfdb118dd2b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f5ab6afd-69aa-4c44-b95a-650222cf09f5/frankenstein_chapter_1_quotes.pdf
    • https://uploads.strikinglycdn.com/files/f9281715-c375-43bc-8d5c-ed636ca9aa72/55266384152.pdf
    • https://uploads.strikinglycdn.com/files/5f0b3eb1-9f9f-4529-8612-d7137a65d981/el_conde_de_montecristo_resumen_por_capitulos.pdf
    • https://uploads.strikinglycdn.com/files/c41c3437-6f74-4455-9518-07784a8e03cc/autocad_2013_free_software_for_students.pdf
    • https://uploads.strikinglycdn.com/files/81922e5c-ecad-40bd-8c7e-a350d376d381/48018362519.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9f1.bin
31b85872165bc8ec8f92fa426e8e58c0ea6238994c487664f361e957c9361055		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 5288 bytes
font_01_sfnt_off00010bfa.bin
6f9e55abe0872ada93b3dda8c3f5a9d3bf15db0c71b1bd564a42c2689b5e8722		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 10956 bytes

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