Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55016757d297043…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 17:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77ea0f687d4b2d9ab72769f0678bce60 SHA-1: a92612dfc04e632394b2d0044395c47f00d20e8e SHA-256: b55016757d2970438d604a5ce7bd545daa1fdccd69e756d40158ea54dcb45cd2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded links suggests a redirection mechanism, likely to facilitate phishing or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://hyundai-dongdo.vn/images/files/gerawuzu.pdf In PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/jiwuxuwifolari.pdfIn PDF document text
    • http://healthywithhart.com/res/file/63506700029.pdfIn PDF document text
    • http://change4best.ru/upload/file/58782073396.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/miviten.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/wapavukil.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/52537011042.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/nukefudisebujilezowiwedub.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/xagizimipub.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/48899556569.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/bodizotulopibajuxipuxep.pdfIn PDF document text
    • http://odumakus.com/uploads/files/mafamerekojiburodazobufit.pdfIn PDF document text
    • https://majubesar.net/contents/files/zezaxelega.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/14100177880.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/22035908038.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/92336202030.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bad03cb24c---kuxisesovulim.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16153ac2ccc361---35632986744.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/nudomulewebisesemosu.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/95209398632.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/pusevuj.pdfIn PDF document text
    • http://divelife.kz/files/file/denuwasubiwedotagifo.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/junugiloro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=harry+potter+telugu+dubbed+moviePDF 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_off0000aec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D7 10876 bytes
SHA-256: dccf0fa64b53fb99f8909ed910ac8432751a2da647df2ed91ac7b6b52673d22f
font_02_sfnt_off0000df85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 17016 bytes
SHA-256: 54375c62275098da45ea468926e9b8347dc62cf1421c01819e4403d6665c4aa4

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