Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ba71f59e796c9f…

MALICIOUS

PDF

76.9 KB Created: 2021-03-10 18:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9caf1ea94d38da3ada6b4f5fdfcc8917 SHA-1: 98334fd9b0766ae6020ebcba70e4820f361addf3 SHA-256: d5ba71f59e796c9fe99ed52850e1985bef670ac58313bb739c97e7c83522d575
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/wix?keyword=cadmium+yellow+vs+lemon+yellow PDF link annotation
    • https://likojekiputisi.weebly.com/uploads/1/3/4/5/134576895/lomedasul.pdfIn PDF document text
    • http://reduslim-ordina.site/53321849783yeufu.pdfIn PDF document text
    • http://afracheat7.xyz/std_testing_windows_guide0ivmq.pdfIn PDF document text
    • http://parkji5x.xyz/coso_framework_for_internal_and_financial_controlsa06u4.pdfIn PDF document text
    • http://lifeit.pro/folupu70ho3.pdfIn PDF document text
    • https://zutelosedetadof.weebly.com/uploads/1/3/0/7/130774966/nakuz_gukaj_defapa_munemuris.pdfIn PDF document text
    • http://smartcreditcheck.info/getixexazuw27.pdfIn PDF document text
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/c47d47.pdfIn PDF document text
    • https://fojojaroj.weebly.com/uploads/1/3/1/4/131453509/nasatelut-jamug.pdfIn PDF document text
    • https://zetojaxonafavop.weebly.com/uploads/1/3/5/3/135309172/8f7a07b9.pdfIn PDF document text
    • https://silorofolukut.weebly.com/uploads/1/3/4/2/134265947/1d9d25cede3e95.pdfIn PDF document text
    • https://jelakuge.weebly.com/uploads/1/3/1/8/131856802/5429664.pdfIn PDF document text
    • https://rusuligoxajikug.weebly.com/uploads/1/3/4/3/134399392/bonosizoju.pdfIn PDF document text
    • https://razivizufizide.weebly.com/uploads/1/3/4/5/134525322/4823716.pdfIn PDF document text
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/butowikumo.pdfIn PDF document text
    • http://reduslimer.website/44559399620z9wpr.pdfIn PDF document text
    • http://save50it.info/vox_ac15_handwired_for_sale1nqc8.pdfIn PDF document text
    • https://wixurawitubeza.weebly.com/uploads/1/3/4/3/134319602/3977450.pdfIn PDF document text
    • http://koolmaxt.online/fesogegoraxesodiselesuqlg40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_c5d38c35b0fe46d3a208e0ee67a20883.pdf?index=trueIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_6e843fc33f294cc4a3a4e439beeec4e8.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_89a939828a4d43889834f423425ac4be.pdf?index=trueIn 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_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 5032 bytes
SHA-256: b15e8e07ddf8db2a4f4cb2b907dfb715733d71c60dd94dcda2b4c3c50bd5133c
font_01_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 10348 bytes
SHA-256: b673797025c454d4f920d5eb967d947b6a8b9d2464995360456f4ea9809acb1e

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