Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef366f553c6b56d…

MALICIOUS

PDF

87.9 KB Created: 2021-09-14 06:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c215c1b5bf57b2200aa12cbb271ab705 SHA-1: 3b35ffa64f03de55d7f2906dd99f17114b56d791 SHA-256: 7ef366f553c6b56dcdd4853d204629be43b9dabb8c8c8bd7a6c6066170f26290
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://queure.ru/uplcv?utm_term=is+there+a+way+to+see+who+stalks+you+on+instagram PDF link annotation
    • https://quatcongnghieput.com/uploads/files/35976702476.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/bizesolodazobozinar.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/wubajerapunilisanufod.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613003bce513d---19942312523.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/vudatufarevakosugevumama.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/wixamixizule.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/45524643023.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/17198499747.pdfIn PDF document text
    • https://arerp.kr/data/file///20740817799.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/65728478003.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/31887120656.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/medazulaweje.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/62748454671.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/9233580538.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/kubap.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/39089751826.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/54414667266.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/52376626058.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/27854382920.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fubufasutoru.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/4879876757.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/tumenawidirajew.pdfIn PDF document text
    • http://baove24h.info/upload/files/balubukabinafed.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/gazalame.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/rotavituxojafomite.pdfIn PDF document text
    • http://rayanchem.com/d/files/zuvixoliwujakuwawejer.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/wovelerumarofala.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_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 10896 bytes
SHA-256: 18bdf3327ff2c3941389e7cbdf9b7a18ee7d83b459d9354c1426f139137e0581
font_02_sfnt_off0001221c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221C 17960 bytes
SHA-256: 3c7fa39a16908d6594fe8e58c45d5ce87748df3457a8d120eb259ef71a1616c6