Malicious PDF — malware analysis report

Static analysis result for SHA-256 29852249c8abb77d…

MALICIOUS

PDF

63.7 KB Created: 2021-09-21 04:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a8d9c2fe9dde8eeb901a030084ee34e SHA-1: 02097231d8d46b3b63c0dd49b24e2659284f37b4 SHA-256: 29852249c8abb77d3f0e97b98295526070e0f6fbb27b56a8264523563250cf53
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by multiple heuristics and a machine learning classifier, specifically flagged as Pdf.Phishing.Trojan. The presence of numerous external URIs, many pointing to PDF files on disposable hosting, strongly suggests a phishing or malware distribution campaign. The PDF itself contains obfuscated content, indicating an attempt to conceal its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8922

Heuristics 4

  • 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
  • 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://wastran.ru/uplcv?utm_term=convert+pdf+to+dxf+in+autocad PDF link annotation
    • http://internet-trade.eu/UserFiles/file/41794740233.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/dunijotosesomilevuben.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149143449595---28492651261.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/48939090566.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/71948654142.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/48719332295.pdfIn PDF document text
    • http://isgsrl.it/images/file/30104965832.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/16976811586.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/2463792411.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/tibolaj.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/51706514783.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/57930136917.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/85038323714.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/poluzeguvan.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/51500416925.pdfIn PDF document text
    • https://andhimazhai.com/images/files/pifotisedesonisomogug.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/waledolibarozixotifipiti.pdfIn PDF document text
    • https://harmony.im/userfiles/file/2207569109.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/tajomajezuwifig.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/q58am9mnp9q3mmar5o63381hpk/besutusegorewirabase.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/71754538431.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/33742059881.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84D 18084 bytes
SHA-256: 51a213b97caa69a3dc80a3177c98b56d108a1ae419dfe29d07dc407f1f998ee5

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