Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f16f27db0eb018f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-15 15:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 022eca7d3a07ad32ad16ff8d848d0481 SHA-1: 327152d71500399623909faa887668eafec6d5ca SHA-256: 3f16f27db0eb018fd1d2c794ffd68d77fb9cbea2e85fc9bd5ebe8a65d10a7085
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The presence of numerous external links, many on disposable hosting, and the 'urgency lure' heuristic suggest a phishing campaign designed to trick users into clicking malicious links. No scripts were extracted, but the PDF structure itself likely facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://haiphongcontest.com/images/files/zoxigajevenenulotape.pdf In PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/839790069.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9f294efce---67757903862.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/kufuxenenizasu.pdfIn PDF document text
    • http://sdes.in/uploads/31105113800.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/70801929258.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/namomomoloxanezolo.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/78489557519.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/11124209244.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/21409883764.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/dixub.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/kebiretilezebefolekolala.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/diborabenoberevisudubej.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/49003910935.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/pugaxo.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/25973965456.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/9743820948.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/rorobado.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/97533457126.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/petowixaxujijafobesubufi.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/lixifemidawovulowapedul.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c859b56a4b---81484875963.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/kejinixap.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/kusibagusepen.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/didegowidogulolebuzadilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=partial+screen+recorder+androidPDF 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_off0000e234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 10364 bytes
SHA-256: 86cb0ff834f9ace62c6bbbb2765a897eb4a565b4ee5619718631a34e9701bd8a
font_02_sfnt_off000111ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CA 18092 bytes
SHA-256: 63fd6b873fb212f76cf7f9f339f5a9074033a83f696c5d1f32358dbd1607f559