Malicious PDF — malware analysis report

Static analysis result for SHA-256 7540557df73c9e55…

MALICIOUS

PDF

114.5 KB Created: 2021-03-17 22:34:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0dff3ce46ec4b83f9e17f7c8b771cd9 SHA-1: 10581012e34d13cdbcf9f1639506dd8d788abae7 SHA-256: 7540557df73c9e55f94d72e6284d469f93c6b042f82a57dc64e95db2dda1d15c
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or obfuscation, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/123?utm_term=buckethead+live+performance
    • https://pugoxadegile.weebly.com/uploads/1/3/1/3/131379866/garazitog_gutuzuz.pdf
    • https://cdn.sqhk.co/devuzemalut/ggJhhjf/fall_boys_unblocked_games.pdf
    • https://jazediwugitali.weebly.com/uploads/1/3/4/7/134730671/8902799.pdf
    • http://ayazshabutdinov.club/90841001400p47js.pdf
    • https://janafapaxe.weebly.com/uploads/1/3/1/6/131606835/monej-zelokodijerox-kukunawikinuw.pdf
    • http://tehnotop.site/xuxelifomupopowukopozayu6gm.pdf
    • https://cdn-cms.f-static.net/uploads/4455894/normal_6041555b7549a.pdf
    • https://gabinomila.weebly.com/uploads/1/3/4/7/134763369/bepopo.pdf
    • https://cdn.sqhk.co/mubutuve/WgcKjjE/infinity_ward_games.pdf
    • https://cdn.sqhk.co/pasivuzuke/djg5Gig/10971669929.pdf
    • https://cdn.sqhk.co/budatumibowu/doig4hf/56600037742.pdf
    • http://reduslimitalia-ufficiale.site/cake_recipes_from_scratch_red_velvetdbeyv.pdf
    • http://grantmedica.ru/dodge_ram_repair_panelsduxrx.pdf
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/9518984.pdf
    • https://danegatazi.weebly.com/uploads/1/3/0/7/130776269/6996544.pdf
    • http://iuts.space/aha_bha_sheet_masklzpxq.pdf
    • https://static.s123-cdn-static.com/uploads/4371023/normal_6006b2c831e02.pdf
    • https://static.s123-cdn-static.com/uploads/4368474/normal_5fef9976ba595.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_60f727c0803f403a885fe9fcc82b853c.pdf?index=true
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_127d6c634385488490696858a3fc2948.pdf?index=true
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_277582e969184f7b913713dada662940.pdf?index=true
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_e36fbb6721b64c6b9e3ec764d4860378.pdf?index=true
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_403231cbe3864028a02ab05e6b61be5d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001746e.bin
7db94c055df0696c55cad721579e87a1a679c9e595631d6e2f312b70be527baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1746E 5272 bytes
font_01_sfnt_off00018636.bin
0799d451c725638c773b2981322c00f553d2b0bcbd7744b88288ae6fa413f005		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18636 11884 bytes
font_02_sfnt_off0001adf8.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADF8 4324 bytes

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