Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9a84a9d38128bf…

MALICIOUS

PDF

74.5 KB Created: 2021-09-11 23:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff6e393bd7d7baa349965dc8985b9b14 SHA-1: 3b8d1042f4f7fc9a5d0c1172b7d36c57d463324b SHA-256: 7b9a84a9d38128bf0483bb66dd0ec71cd2a6a974f4dc661b19881ae30aa54071
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML_NYX_PDF_MALICIOUS heuristic and CLAMAV_DETECTION rule strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://schokofontaenen.de/idata/desusodidafawiwel.pdf
    • http://boilerservis.ru/uploads/files/88302944416.pdf
    • http://drironcat.com/images/file/76226314434.pdf
    • http://thai-apsproducts.com/file_media/file_image/file/migogenobig.pdf
    • http://flapboxes.custompackageboxes.com/userfiles/files/87107317495.pdf
    • http://studiocalderini.it/userfiles/files/13381579703.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a510e0a058---zumosekibilipixudux.pdf
    • http://sochisushi.nl/survey/userfiles/files/9017204319.pdf
    • https://km2804.com/ckupload/files/80841744840.pdf
    • http://tafgambiatours.com/userfiles/file/juwupixubupejupa.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae8cbb0e3---59031806596.pdf
    • http://alvit-bk.ru/userfiles/file/41088355360.pdf
    • http://dongshengcable.com/images/upload/File/5686856221.pdf
    • http://salman-group.com/userfiles/file/dolavuxodipuzemepaxerokug.pdf
    • http://emirates-offshore.com/uploads/image/file/77010806883.pdf
    • https://interconformity.ro/images/file/4195945669.pdf
    • http://agro-vostok.ru/userfiles/file/98017727045.pdf
    • http://riasztoszolnok.hu/admin/fck_upload/file/64020811151.pdf
    • http://strandedtattoo.info/file/22340716301.pdf
    • https://gaadalagi.com/contents/files/dunen.pdf
    • http://kamienneogrody.com/userfiles/file/beripukituwagaz.pdf
    • http://stillincontact.com/images/mails/file/labatojetufiwanolun.pdf
    • http://baovekhucongnghiep.com/upload/files/15103742790.pdf
    • https://davnosti.ru/upload/patojubobavodaba.pdf
    • http://elitacasa.it/images/file/vebiguwovopuzi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+visual+voicemail+on+android
    • 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_off0000bff4.bin
d7bd4a01ab0b398728b42e3a0e4fe7b78e4f697f819ebae1af0b5baa6cbabd9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF4 10956 bytes
font_01_sfnt_off0000d92d.bin
afce3042dac566e44d574f400be11d0b6bf06042cf32c6dec21e549e601d3a3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD92D 16752 bytes
font_02_sfnt_off00010454.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 16792 bytes

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