Malicious PDF — malware analysis report

Static analysis result for SHA-256 50110577fc776f4b…

MALICIOUS

PDF

89.6 KB Created: 2021-02-05 13:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e13af79ddaca92b642b94592513a97f5 SHA-1: 6c85f5cd0a0d163470515ab25613b285f5313a1c SHA-256: 50110577fc776f4b020cb0fe33a0c6e2f5a614c5dbf2caa335cf6d295952e2a7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious redirection or content delivery mechanism.

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
  • 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://leonvi.ru/123?utm_term=my+hero+academia+season+4 PDF link annotation
    • https://cdn.sqhk.co/zovaratigu/jegjaES/house_lobby_pop_design.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_5fd9196b6f8f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415767/normal_5fc85ebcbe23d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389085/normal_5fecc7fff2c69.pdfIn PDF document text
    • https://lapifebe.weebly.com/uploads/1/3/2/6/132695874/nitafimobor_tofoju_sujopajik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485163/normal_6015fd38ef64f.pdfIn PDF document text
    • https://suzexefovewav.weebly.com/uploads/1/3/4/6/134640410/leninifiras_pedatoradeso_nuxuzitoseb.pdfIn PDF document text
    • https://cdn.sqhk.co/pelazuwoz/dBhi2gd/37368445565.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lomuper/enzymes_catalysts_of_life_virtual_lab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/bailamos_full_hd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/pictograph_worksheets_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/vefepigorejaligoxif.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_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 5340 bytes
SHA-256: 3bbed68cecf364d5f10d46c1b9394b1dca68954013ba02e3cd528847cea86ede
font_01_sfnt_off00011d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2D 10992 bytes
SHA-256: 530f4ffe4c9c1f9c1ab26a360000d24503199ad6168f7ea45d3ed345ef6f1528
font_02_sfnt_off000142f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F7 16648 bytes
SHA-256: 8b5e31b56c8666f355e11cde08e4261c6870e3b5ad24a0fb6f1534b7e8f46cb4

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