Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c0ea29347c072b…

MALICIOUS

PDF

71.0 KB Created: 2021-09-30 18:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9dd44b097b1230b8e3527717fafcfe59 SHA-1: 6415707e406e6804cd4616f9d7773bd1fd9f720e SHA-256: c6c0ea29347c072b827f6bf645065ac6f1e4fdaf179a8bd29ad5b8ff70bd25a2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the document likely prompts the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attempt, likely using embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://standsimulator.com/ckfinder/userfiles/files/87039986841.pdf In PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/45116689439.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/99095574900.pdfIn PDF document text
    • https://aventuraholidays.elladatravel.ro/mm/file/zajofutisiwumewejoroxi.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/94454852764.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/riwubijisudakezara.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/jevinifozin.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/17958410638.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/fotejaximukadigapu.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/dekobigebiji.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/12634718766.pdfIn PDF document text
    • https://grouptm2.com/contents/files/63771329486.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/zalakilavifuxado.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/65191271082.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jadifuvojo.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/dibodumarug.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/13552838030.pdfIn PDF document text
    • http://maxbrio.kr/files/files/61202893583.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/60531714021.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f02c6b0177---dabogo.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/torawuxobamazekale.pdfIn PDF document text
    • http://honda-vo.com/upload/file/rupenapogodekidewebirev.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/zisolelejeri.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/mafatejod.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/ravizurutaj.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/96346631070.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/69462202040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=download+video+da+internet+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_off0000b408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB408 10228 bytes
SHA-256: 11cd85e7b4392e715b766030c57130d052a03a00c05702760aa587ea8d62449c
font_01_sfnt_off0000cb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB15 16176 bytes
SHA-256: aa9d199048badd45deb651bb53b0415546958c65d3f34dcc7d3e8b56695137a8
font_02_sfnt_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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