Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ef40889601211e…

MALICIOUS

PDF

76.1 KB Created: 2021-10-06 12:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6127003892e2fd9343c817f9a76eebb SHA-1: aa17a8a15a63687562714e6be0d81a47a44814ec SHA-256: 42ef40889601211ee45e7a9edf48c3fb018b8cf23db02a2bf9c7590c8b8ea07a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The presence of numerous embedded URLs, many pointing to potentially disposable domains, and the 'SE_URGENCY_LURE' heuristic suggest a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics point towards an attempt to trick the user into navigating to a malicious external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://svetplus.com/userfiles/files/kolomujewikisajivukoxuf.pdf In PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/waxete.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/53107014798.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/misanajekokotu.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/kenal.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/walisenepepanojataxow.pdfIn PDF document text
    • https://kuepancong.com/contents/files/94409932828.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/xedilugukemafevigi.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/wisubiwumoxali.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/34622941339.pdfIn PDF document text
    • http://praguetransfer.com/files/file/20282202524.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/57636515165.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/dilaxubodegodana.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/kupokirinotedebo.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/95480081718.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/37558365101.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/96295165124.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/juxofazegomawobak.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/tulibibojujigezunivem.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/15564142689.pdfIn PDF document text
    • http://namngonviet.com/user-/files/82657350388.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/58404199963.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/69325180070.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/pinikafegugofuzigiwowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=sustainable+architecture+pdf+free+downloadPDF 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_off0000c14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14E 18220 bytes
SHA-256: b8484221976c85556d2596c1b8c6e656a699669497b44837c7ce97eed8acf260
font_01_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 11120 bytes
SHA-256: 95c2a7ee61ec33ad9c048a4cbbab52c4c23cbae85e4627e3f306b3b2f9140681
font_02_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1