Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdaa4db808c9e1a…

MALICIOUS

PDF

68.4 KB Created: 2021-09-24 13:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b990ca9baf2d620097ad16f9bdb14b2a SHA-1: 19cba6eaced3377692008733baebcd9f1ff04df7 SHA-256: dbdaa4db808c9e1a10ad7aaee19b128e54cd980754880f698db3c651baf1cadc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://aftp.bg/userfiles/file/56934493647.pdf In PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/19941490843.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/91997430463.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/takezaxusikaj.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/nexotoboxevisa.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/kasemenimaj.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf9f48e1ee---21396080660.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/wupigefa.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/9164350836.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/29742853458.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138472106b16---xinulesowi.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/79145423553.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/guvifolotukag.pdfIn PDF document text
    • https://sapporopools.com/contents/files/72681001053.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/65877205698.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/dapalotaloniborudumov.pdfIn PDF document text
    • http://holzbau-napetschnig.at/99475108433.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/79160649291.pdfIn PDF document text
    • http://labonscafe.com/userfiles/59972505383.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/lavatewigaluga.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-1/20210901181422260608.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/14687598150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=kof+xiv+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_off0000afbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBD 10064 bytes
SHA-256: 4502253b38f2ef37da7f94981eeeacbbf1572b54287a2b4cc085532d45747584
font_01_sfnt_off0000c62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62F 15292 bytes
SHA-256: 541d0f19901323c4e631dbcb326b6705b4b4c21452684df72b9320a0660ff75e
font_02_sfnt_off0000ec30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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