Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06ddfc18950d1dd…

MALICIOUS

PDF

76.1 KB Created: 2021-09-11 23:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b4ace9b480e2808ddd97e94ac93ffe5 SHA-1: dbd6c304dca3ed418612840501a56ab852ff550d SHA-256: b06ddfc18950d1dd3e169141d7920d6ef0dd53332af056804cc61f27a495fd7b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external links, many pointing to disposable domains, suggests a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://telliogluhukuk.com/userfiles/file/28458494164.pdf In PDF document text
    • http://polins.org/public/userfiles/file/90765927612.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/20714126030.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/76300210914.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/99856122856.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce1e26f4fb---36337256451.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/16783128522.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/pokino.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/samojododunujeluka.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/39019572286.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/84419303579.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/bolesuxetugeboletoze.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/puruluvotumixowu.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210911143350.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/tosenusoxudigizi.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/pupagarelovanilenir.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/vapolojamojawepap.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/rozelosorizaxerekibe.pdfIn PDF document text
    • https://harmony.im/userfiles/file/9288674604.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/2095771723.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/robesagamaxu.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/64560289578.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/96423539083.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_205244.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/31415540137.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/48251212735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=python+crash+course+2nd+pdfPDF link annotation
    • 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_off0000c438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC438 17376 bytes
SHA-256: a27e611b44379269166115850974eb6ffc108dba823eabcd4019bf0d939a1944
font_01_sfnt_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 10916 bytes
SHA-256: a6cacd58ffd8ac423ab162e299b050bb33b11c865bd9a02a3bd089c7df84a5a0
font_02_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1