Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f11466cf4d9e44…

MALICIOUS

PDF

74.7 KB Created: 2021-03-04 04:20:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a774411186f5f8452bd32f71b9a1f9ca SHA-1: a3fc66b2d42351be50707b0d8b8eb7a838adaeae SHA-256: 64f11466cf4d9e4415365d6ce0700baa4178d4e63195e6c2cd13a11b6790ce7f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to 'Blomberg dishwasher ratings' and the wkhtmltopdf tool, indicating a potential lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/123?utm_term=blomberg+dishwasher+ratings
    • https://cdn.sqhk.co/jotoselu/ehchfgC/kozozavofixotonisewowobe.pdf
    • https://gekibevuzoz.weebly.com/uploads/1/3/4/5/134503907/tiririvi.pdf
    • https://suxosuliresud.weebly.com/uploads/1/3/5/3/135351283/tibup.pdf
    • https://zezawimikosalef.weebly.com/uploads/1/3/5/3/135329884/xabujinafojude.pdf
    • http://amaryllis.space/corpus_christi_offshore_weather_report0h9kz.pdf
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/9811337ebb8a1.pdf
    • http://sakulog.sportsontheweb.net/56036583322.pdf
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/3c98b3e0de004.pdf
    • http://doordash.fun/homologous_structures_mammalian_forelimbs_worksheet_answers0egji.pdf
    • https://mixabukosi.weebly.com/uploads/1/3/4/4/134479433/3837152.pdf
    • http://kofojoxake.mygamesonline.org/debi_humayun_ahmed_movie.pdf
    • http://desajegurake.scienceontheweb.net/39737790735.pdf
    • http://akmurzina.com/picture_of_a_salt_shaker178on.pdf
    • https://vadewowiruku.weebly.com/uploads/1/3/1/3/131382700/naretu_gusete.pdf
    • http://qwertyujg.xyz/42642167820p2za8.pdf
    • https://riluvozig.weebly.com/uploads/1/3/4/3/134380056/nupig_mosamobova_lededikolep_wetetofevotoso.pdf
    • https://jerupixudenaxi.weebly.com/uploads/1/3/1/4/131437293/magabavifaned.pdf
    • https://cdn.sqhk.co/goberirud/r8jejdk/20386304341.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pekafujojef.onlinewebshop.net/african_wild_dogs_eat_human.pdf
    • http://pababevo.epizy.com/hillsong_worship_broken_vessels.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67d.bin
5fb6cea0ccbf08a7563fd5cafe9d7ff9a87267611d10ee13fcc150d68e4ee382		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 5520 bytes
font_01_sfnt_off0000f922.bin
f9837b7806fbc2c31857605c7584c6180f0725cce2a6e7c9e3d792d02f0c08bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 10836 bytes

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