Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfbd9dda8db1a54…

MALICIOUS

PDF

76.9 KB Created: 2021-03-15 19:34:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b7065124279856b31be282e459e9c504 SHA-1: c21e8b53df442306952b7b3d893459e5427cdf59 SHA-256: 9dfbd9dda8db1a54701ec5727c6fbf1452abddefd308412f1b09f97229af13f1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://midufefew.ru/strik?utm_term=samsung+m2835dw+replace+with+new+imaging+unit PDF link annotation
    • http://winoorama.website/how_to_write_interview_in_essay_formatjqyqd.pdfIn PDF document text
    • https://cdn.sqhk.co/metajewamiva/j7ckha7/98987445456.pdfIn PDF document text
    • https://cdn.sqhk.co/zedazisem/YBxySdh/44466072284.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385648/normal_6002695e30c2c.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/what_is_pack_line_defenseqansj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407756/normal_604ce2be0e5f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77abcf6a-1f47-4233-a5f7-28832101be0a.filesusr.com/ugd/e29e5c_37ea5da0384f4bc9a8cf0f16e6486548.pdf?index=trueIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_7698e279cd364d428034c5fd22385406.pdf?index=trueIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_3e8a2c26002045a5a9b1e52e5a7bcf4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/321d9bc5-2756-4e6e-bfb3-d3b528d2357c/80164567196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8222e48d-f089-4de7-8dab-376058aedb96/angelina_tommy_emmanuel_guitar_lesson.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_7e4a6ead717f4bdeb92e8705ee2abe45.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55fb4b79-94bd-4b89-aafc-081c664caa29/altered_carbon_netflix_series.pdfIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_95ffa416137f4e9aac414a681c86f1da.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_7660bc8d5a024722b94e8104596e0a3c.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_930e4a52071d4cf4aca73092a0a04a35.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a4a8ac-fb89-4253-8c10-dde8653800c4/fesasedukiwal.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_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 6296 bytes
SHA-256: e8e5a27d5d7df108b6a70f073af6e4e3c32933127b14991c3c49eccb701f44e2
font_01_sfnt_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 11288 bytes
SHA-256: e64b69fec28f41cb58e7387d7945a383a55b91b85a56b4c77800b3a29ba127c0

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