Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84fecd301a71c3f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 01:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e35986b4f4ff47a5730c9d723a684062 SHA-1: a2d6cdf2900453984a1ce6e87e8da559db14cd26 SHA-256: a84fecd301a71c3f0454ac9e811ed3b17f59b2f7e5dea87aa842319317da7e5d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL suggests a lure related to a popular game, indicating a phishing or social engineering attempt to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=super+mario+64+odyssey+rom PDF link annotation
    • http://marcth.pl/media/fck/file/dolegelepiritefonaza.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/kujulawogazuwesobe.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/sojubiwarakufobuzepar.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/77052672883.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/gazore.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/jigixi.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/19659592193.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/79940847563.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/12420557069.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/bumunawedojutovamekinosiv.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/67558783665.pdfIn PDF document text
    • http://terminsk.by/pics/files/kosajeri.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/zavuvemuwusa.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/tijibonapixas.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/72808667484.pdfIn PDF document text
    • http://c-amc.com/upload/files/jiwuwegesuporaduti.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0a11fc6d6f28cee9ee041a1ea29ff301/jeragerazowine.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d59789e5f4ece119882efc1ea912779e/53232206423.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/lilaberizosolof.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/gipavatoxoj.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/42797822737.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/sawixufitujutodur.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/kogaxekaruxabezipepuvoso.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://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_off0000d168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD168 18192 bytes
SHA-256: af076f3a6dd7d8cf1b3c45b777cd6a0ae200a45fa802b652c788c581510ac550
font_01_sfnt_off000100dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F4 10840 bytes
SHA-256: 2c22e2ce718fd31db2307e19c6b60ddc54e7ce1c722706f2a7a20285236ba20a

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