Malicious PDF — malware analysis report

Static analysis result for SHA-256 1869b92cccf81ddc…

MALICIOUS

PDF

84.2 KB Created: 2021-04-15 18:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9c2e76e9be359adf4526a3d54b884013 SHA-1: 943b772e4cd5e8299d0d6b25895dfff85b2dd6b7 SHA-256: 1869b92cccf81ddc800339aed452c9d885d210114c423916fa86b5d1adc8e9be
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many pointing to disposable hosting, suggesting it functions as part of a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://fokemale.ru/strik?utm_term=best+free+daw+for+beginners+windows PDF link annotation
    • https://sunowakodi.weebly.com/uploads/1/3/2/8/132814938/0daebb13e1.pdfIn PDF document text
    • http://pipexob.66ghz.com/10787495977.pdfIn PDF document text
    • http://orehi-siberian-force.online/bovitiwokajuwafafovat00hfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409258/normal_5fd08ecd85bf5.pdfIn PDF document text
    • http://torchqbfl.fun/44903822939fk56o.pdfIn PDF document text
    • https://tajudazu.weebly.com/uploads/1/3/4/3/134328852/zamusu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373757/normal_60039a28aea22.pdfIn PDF document text
    • https://bodobazanukabub.weebly.com/uploads/1/3/4/8/134889783/gokezajas.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
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_d89c5ef95ea8470a874839469b1c45e8.pdf?index=trueIn PDF document text
    • https://8aa13d94-a051-4bfa-911d-5e7c2f772018.filesusr.com/ugd/382cc4_f397bd3610fd49febfa157e4659bb094.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/9842290896.pdfIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_40b5c0254613499eb57eb635d2419ad8.pdf?index=trueIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_2646ecbf1838483c8fa05b0532f610df.pdf?index=trueIn PDF document text
    • https://fc9a8e44-b853-4378-b933-957c6fa9ceda.filesusr.com/ugd/1da781_a5d7ddb98a864c00995d6585d9f356a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/lavonusotigifavotezetu.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/cissp_cbk_4th_edition_free.pdfIn PDF document text
    • http://wivepepubaj.rf.gd/rebujirav.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_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 5112 bytes
SHA-256: 6f136fa5b93301feab01f5a3bcf8edc71cd97c390d6cfe2be15d1c64a9de4c2e
font_01_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 10596 bytes
SHA-256: 9f7b8bccfa6e3aaefab0995149c6c438fdb65a1c05ac8c509646d1aaa4230609
font_02_sfnt_off000135cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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