Malicious PDF — malware analysis report

Static analysis result for SHA-256 717d9d5f3092c9a0…

MALICIOUS

PDF

133.5 KB Created: 2021-09-16 10:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82014b78791e63df66021942ff6d0877 SHA-1: 2e34044c903211dda8f974dc20318c92076f0478 SHA-256: 717d9d5f3092c9a05ae1f50cc97966170047bcf39991070a16cd45b994d2a4dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=android+tv+bootable+usb PDF link annotation
    • https://drlalashow.com/php/billboard/uploads/file/26275909707.pdfIn PDF document text
    • http://espokebar.com/uploads/files/75517742015.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/gekumemuvapadegifonimulag.pdfIn PDF document text
    • http://nensi.si/upload/file/9075918777.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/94972779478.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/73a3ff35a8e038d6466b9b7f79880d95/72197466971.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/ronefekezofodevad.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/67147238939.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/vujapiduge.pdfIn PDF document text
    • https://majubesar.info/contents/files/77848601065.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/77919526551.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/95156132500.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/50322023625.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/92150872589.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/kujadodewesuzonugel.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/67842191143.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/lafitamifobatiwitodek.pdfIn PDF document text
    • http://rem-proekt.com/f/file/wakilasakomutufurusonazan.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/tavusipanunibanoberig.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/loraxuja.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/gavujig.pdfIn PDF document text
    • http://proart.by/media/file/9479629184.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091323443749.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_off0001a1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1F4 20272 bytes
SHA-256: 5e956fa17ddbdb130ae3c3184be6b11e9ce7244e73fc030f0803078fb09fc544
font_01_sfnt_off0001d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFF8 10528 bytes
SHA-256: 9a7d371649996fe822e2e2098c35cb61799d8ae2c185eb33121755f81bcbfd2c

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