Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9b5c73050ff331…

MALICIOUS

PDF

68.9 KB Created: 2021-09-08 12:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8759d36e2867523afd4ec0556d354488 SHA-1: 373d580716d8ea943d5e55844fe0486782706a16 SHA-256: 1a9b5c73050ff331635fe75d4d5ffeb4154afa0fdc58fe9c58c18a9820742a94
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a link farm designed to redirect users to malicious content. The file's structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://pistant.ru/uplcv?utm_term=scope+of+the+study+pdf PDF link annotation
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/xakuzilosur.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/35217117300.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/56602522165.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/temuxokukidekuvegik.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ecc422233---janejufaguzaj.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/bazinamivefadus.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/54823137733.pdfIn PDF document text
    • https://digireg.at/upload/nowozilunolinuta.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/fubonoveleja.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/28601530962.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/nufamubipat.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/jametejomo.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/20607370310.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34010984189.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0903/8249f0291e3ce83f988f150e7de35638.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/27474645048.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/2225435478.pdfIn PDF document text
    • http://www.praasia.com/file/files/xomepubozusexabi.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/majed.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/98359931397.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/16832720472.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161387f0cec853---besorodulez.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/wapatamoko.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/33149283479.pdfIn PDF document text
    • 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_off0000b1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EC 14732 bytes
SHA-256: bdd094f289df2454e5136f57e66be4c4a38bbb21d86441ff828bfc7a2aad6835
font_02_sfnt_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 10504 bytes
SHA-256: 801a2841a23024c5575c5dd91dbb668098a1fa37009a54b87799e9ec8346006a

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