Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3d5c89e5210a19…

MALICIOUS

PDF

72.2 KB Created: 2021-09-26 17:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ecb47b62b645f1dca29de452ed797421 SHA-1: 0516943d8d0e36d281933f518e205425490554e8 SHA-256: 8a3d5c89e5210a19051ea2bf382830c7ecdb311673b4caacdfc8618db92b5690
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or SEO poisoning campaign. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure points to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd95e597af---85143939996.pdf In PDF document text
    • https://total-sport.pl/img/upload/files/vipugoboramejapa.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210922164503156.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/wonirusozo.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/17811784041.pdfIn PDF document text
    • https://tcremich.lu/files/files/dezetoj.pdfIn PDF document text
    • https://mar3ol.com/Files/files/zetisomi.pdfIn PDF document text
    • http://benrassam.com/uploads/files/79621483298.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/4535703826.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/roxelesirupenilok.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/90411409337.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/99804256365.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/mokavawefonusog.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/69497006700.pdfIn PDF document text
    • https://5uempat.com/contents/files/botevulub.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/12875843621.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/14813741146.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/fazenugamobefup.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/28527853056.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/73188137750.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/femasubisoxelulutomi.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/xuxebupawosejivilalurizod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=lightroom+software+for+pc+free+download+with+crack+32+bit+windows+7PDF 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_off0000af70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC787 11684 bytes
SHA-256: 007279b77e7eb191145c4b3ab63c4d7af794b9873e001e6387604ce118b31f76
font_02_sfnt_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 17684 bytes
SHA-256: d4c2eb4e1b2b99e9b996ac52ebbcd049d0cea0fe755384984d790bbff95af672