Malicious PDF — malware analysis report

Static analysis result for SHA-256 4912737d5f04a43b…

MALICIOUS

PDF

44.1 KB Created: 2020-11-08 01:21:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7e66ac2b6ffca71f36fe386502fae738 SHA-1: 2eea758f3633ea74b3b3156cc623a7010477cd15 SHA-256: 4912737d5f04a43b745d7585ee67f1a41adbaee05fe87e53fae95e29173ea810
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a link farm. One prominent external URI points to 'trafffi.ru', suggesting a malicious redirection or phishing attempt. The document body, though heavily obfuscated, contains the same URL and keywords related to technical specifications, likely to improve search engine ranking and attract unsuspecting users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://trafffi.ru/123?keyword=rcp+pipe+dimensions+pipe+wall+thickness PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/wakefield_bayesian_and_frequentist_regression_methods.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/25953209295.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2f30aa-37ed-474f-9108-88d83aa6052b/48102075619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf0b1159-0603-4f66-ba2b-396cc18349f3/foxuzukodadaxejurefupa.pdfIn PDF document text
    • https://demugomido.files.wordpress.com/2020/11/17890759962.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/70144407350.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/africa_subsahariana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22758dbe-46ff-45d9-8de5-92b8e3a39970/93850132516.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/sites_ptc_que_pagam_em_euros.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/97748695299.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/download_free_pandora_app_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d8a2fe-7699-4436-9feb-998f4a31b3f0/star_trek_vr_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/graphic_designer_portfolio_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc5ebb9f-1f9c-4d67-b839-da612ce5bb3c/manually_set_system_restore_date_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/45847861369.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E33 5380 bytes
SHA-256: f4396c125939dec0b0388d291ab2c75f57d407a3bd2f1fbfec5d25c3f5400f9e
font_01_sfnt_off0000606b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x606B 14024 bytes
SHA-256: 6f4ccdd917d15480b7b7d217b280276c21decebe9777743fe7c944d59b519047
font_02_sfnt_off00008b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B8C 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

Open this report in the interactive analyzer, or submit your own file for analysis.