Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0a02729bc98960…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 01:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 370518b4d02053a8abd31272568610f3 SHA-1: 0f8cff6cbce229276d684281aa06acb55820ff3f SHA-256: 2c0a02729bc9896014232aa0c898fd5f9a5750b255309ddf9f07986243f25b19
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chcial.ru/uplcv?utm_term=how+to+reset+lock+screen+password
    • http://lexprikson.com/admin/style/images/userfiles/file/82146191935.pdf
    • https://fishuntpesca.it/file/55086399884.pdf
    • http://sieuthivatlieuhoanthien.com/upload/files/risipak.pdf
    • https://dveropolis.ru/upload_picture/pijetamewozekiluloxevini.pdf
    • http://rsti.biz/files/fck/file/61987801713.pdf
    • http://www.sauminandy.com/fckimages/file/89844107076.pdf
    • https://shevtsov-art.com/uploads/files/gexarilelesebijetib.pdf
    • http://kite-surf.sk/files/8773858608.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/kolikilibenujegogej.pdf
    • http://apmnir.ro/fckfiles/file/fexuxup.pdf
    • http://mtecommerce.it/public/news/file/4337476263.pdf
    • https://96662888.com/editor_upload/file/baxalodekagodixufudami.pdf
    • http://istvietnam.com/rich_editor/file/26535523207.pdf
    • http://labotinnghia.com/img/files/wizavamojubona.pdf
    • http://accutindustry.com/Upload/files/20210916210036.pdf
    • http://attlas.center/userfiles/file/rumowavupoborogamawil.pdf
    • http://evevoyance.fr/adh/.-/file/pufupazolotagug.pdf
    • http://evola.it/userfiles/files/62197111548.pdf
    • http://thermocomfort.ca/userfiles/file/68243413337.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614aed8bb876d---62494099058.pdf
    • http://abwingsde.com/uploads/files/jikijiwifupoxu.pdf
    • https://melnikhouse.com/userfiles/file/dujedajevegakokumixisor.pdf
    • http://kjphotocon.org/data/userfiles/files/wavafotogafoxikubunatubab.pdf
    • http://abwpetersburg.com/uploads/files/livupibetifemunateta.pdf
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/rasapujepede.pdf
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/25360385955.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b52e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB52E 16792 bytes
font_01_sfnt_off0000cd40.bin
6e0f1e95dead719efa6adb9d87006ddfaa0ccaf24187dd7cc84625bc54d7149d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD40 16784 bytes
font_02_sfnt_off0000f81a.bin
7aac6088050e39698c51ae660c67beac084269f37152908fa2e605b7e4c49d95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 10584 bytes

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