Malicious PDF — malware analysis report

Static analysis result for SHA-256 2126c8c7ef567856…

MALICIOUS

PDF

82.6 KB Created: 2021-03-19 06:12:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5b3ade97255615bdcc87d0e2b90473e9 SHA-1: 27b1067db5503e2fcb56e94d582286228fd07f6c SHA-256: 2126c8c7ef5678565752098b0973a8b5b9d3d8b0c66721548d0999ef76f750c5
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The file likely serves as a lure to direct users to malicious infrastructure, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=braille+alphabet+deutsch+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_5fe8758eafb6d.pdfIn PDF document text
    • http://cartest.pro/92472869844t20x0.pdfIn PDF document text
    • http://lnstagram-helping.live/the_secret_law_of_attraction_videonczb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460076/normal_5fe23d6dace82.pdfIn PDF document text
    • http://krym.today/draw_a_giraffe_around_your_handittr8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416932/normal_5fca7cfc18556.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376866/normal_5ffb2f92a96ef.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/75171350684i2q87.pdfIn PDF document text
    • http://complerbnp.com/game_of_thrones_new_20204js0b.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/english_module_for_beginnersdvlp8.pdfIn PDF document text
    • http://chategratis.online/final_fantasy_13_walkthrough_jegged124xt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393761/normal_60510a8f735a8.pdfIn PDF document text
    • https://garotilalu.weebly.com/uploads/1/3/0/7/130739336/c46e22ab04e.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/1059002.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/c2314c4a-54a8-44a9-885f-b5d254fdebb5/33228800974.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_7b27253fd4ef4a7b84ba4ff5ffb15e5a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f01d9390-1b18-484e-a794-9b098c6e357e/30054956307.pdfIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_a12e85cd1853417e9239bebfd6db83a1.pdf?index=trueIn PDF document text
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_dc7a11f9cc9d4d94b7b9cc9c344aa0f3.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_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 5432 bytes
SHA-256: c083df87724d56e6b4505f6a1560d3f8df18e819ee93448683e536f83e88f93b
font_01_sfnt_off00011153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11153 13460 bytes
SHA-256: 7886642764580a2cb8347ae6050bf0f29bbda22190a3e6d9ca295a6b2a78c845

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