Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4de371ddb95a8ed…

MALICIOUS

PDF

77.6 KB Created: 2021-09-11 14:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67d0cf1f7415fa8421a6721a02703c29 SHA-1: f72e96e3dcabfca5258ec3d2e0773eee5d8e064a SHA-256: b4de371ddb95a8ed870ab136d5332b499e9ca4354853848e18dbc763ecf43ec4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and also by an ML classifier, indicating malicious intent. The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating a deliberate attempt to create a link farm on low-reputation hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://smidgel.ru/uplcv?utm_term=play+store+app+is+not+opening PDF link annotation
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/xodunasoniri.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/93419133515.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/dufujisezidatojofoxavam.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b3d75aee8eba259159306956772caa54/memulolajafuxofokeb.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/wakoreto.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/zipuwoxujemogufixawavafep.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/mazatelomuvafilagabomob.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/91561127943.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/3547561435.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/xujebilimijagij.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/64035567259.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/tajojek.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/soxegevaxovusi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4107741c550520a729800c876b3efdc1/64051531363.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/27304644112.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/66198353455.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/koxep.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/sevabepumuwagegepab.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/657232493.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/zukufovivipuposozefamo.pdfIn PDF document text
    • https://rubfila.in/files/file/tijexufogesotida.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/bavekamimubokebevoju.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109021227532622.pdfIn PDF document text
    • http://446888.top/userfiles/file/70869427520.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/nibefebe.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/36776890826.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_off0000c9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 17740 bytes
SHA-256: 7c829905f49dadd3d0addc7f770157acde573142a31645a3ace2462212fa762b
font_01_sfnt_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 10540 bytes
SHA-256: 23bb7cc8ae330ee10bcaa632e529c904abceff75a24bf809232ad65bf16300e4