Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de94d2bbaca8213…

MALICIOUS

PDF

78.5 KB Created: 2021-03-08 01:26:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 07b3a89f1a9ed9764714a458893ec666 SHA-1: 7e74af79a3fa0d4b8d38073c39f7810ac6252bf3 SHA-256: 6de94d2bbaca821399abcc1bcf74296d103f46cd49cf1e5beeddbd507295a9d9
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/wb?keyword=strong%20willed%20girl%20quotes PDF link annotation
    • http://zumikavu.22web.org/xudiluvepabejatenufeto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490528/normal_5fe5a54bce5df.pdfIn PDF document text
    • http://mekozeka.66ghz.com/41081223902.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407804/normal_5ffc78385d868.pdfIn PDF document text
    • http://malalij.iblogger.org/genetic_variation_in_gpcr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369187/normal_5ffc2004e544c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f513e6-f823-451b-b209-193f52003b3f/janikixizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498a4728-376b-4cd9-bc23-91bb5629295d/66182833031.pdfIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_3a338bc76e924133a77922355c486057.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8150c0-19b6-4790-bfd8-ca39e0efeb82/asus_p6x58d-e_manual.pdfIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_71270d2c7a974dc9a0c72a7c9519f73a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tulosa/free_3d_bathroom_design_software.pdfIn PDF document text
    • http://tojopoxirer.rf.gd/rozizerepetedox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb9b006-b3e9-4420-ba35-70023281a576/latuz.pdfIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_7e47e10b112c48d888c126aa51b66b87.pdf?index=trueIn PDF document text
    • http://zogivumomu.epizy.com/gofubixixoxi.pdfIn PDF document text
    • http://xizilagitakov.epizy.com/andromeda_substratum_apk_version_28.pdfIn PDF document text
    • https://d3a092a6-6aba-4e73-b2ea-a476a70afb39.filesusr.com/ugd/84a5c6_593f128b30d4415f8bf40cdf92aafd81.pdf?index=trueIn PDF document text
    • http://disofebuwugojuj.epizy.com/axure_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/jowokojedozosagasal.pdfIn PDF document text
    • http://tuninedup.epizy.com/calendar_templates_google_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a6aa41-9714-417f-8485-86c3d3a83d31/48690644608.pdfIn PDF document text
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_01525e30a4c7453e94c54ecd0b87fd96.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_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 5104 bytes
SHA-256: 96e20263677ea8783338a206813bd54492683269e72ad607b0429fbc755e2833
font_01_sfnt_off00010848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 10764 bytes
SHA-256: 07f11ff29e33e4a9370a7b36cf7cf54d81f064a5ebb533b856194e4ee976eb7c