Malicious PDF — malware analysis report

Static analysis result for SHA-256 006f828b83e1ca04…

MALICIOUS

PDF

74.5 KB Created: 2021-09-17 04:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 96efadaa20b6fa1b9d39ba708e5aa46c SHA-1: 071404bf126d73d7c594202e9539d730863583e9 SHA-256: 006f828b83e1ca045d6c59b8798199c26044169c130f0d2ae7822144ab5322ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm on disposable hosting, pointing towards a phishing or malware distribution scheme. The embedded JavaScript and external URIs are likely used to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=ulysses+speedometer+app PDF link annotation
    • https://www.sterlingsez.com/ckfinder/userfiles/files/kevobodufaxume.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/34203025292.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109072108516704.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/52231269313.pdfIn PDF document text
    • https://samowar.me/upload/file/94622048170.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/zuwikufizezasufa.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/rurigogoxa.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/99179462765.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/guwifasemik.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/abc66542af07f1159f0112a2501189eb/forojaseloze.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/vikidavajironamido.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/61013821487.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/72149811006.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16142c41732777---garusubexatagobumomixusob.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/57975028311.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210903183445.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16318335538296.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/47702474831.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/dutatemoxumod.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/zunomixojezilofaxunarize.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/31565089738.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83908082529.pdfIn PDF document text
    • http://nenorm.com/files/files/mivojawerapudujefaxuboxo.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/narukimuji.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/81948146447.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_off0000c1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FE 10480 bytes
SHA-256: 8da20a9def6407243454d507b0a9ee9cdcad5eeafe5299ca949bfaf28016ccff
font_01_sfnt_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 16612 bytes
SHA-256: b8d41d4b1eb9a157216a71e305b0712605e51f29619f817030d14878a60def5e