Malicious PDF — malware analysis report

Static analysis result for SHA-256 872faa9770647b6d…

MALICIOUS

PDF

71.5 KB Created: 2021-09-13 07:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c019fc71d475a038676d733ac99f3b6e SHA-1: f75e1f4a10390b17244282b9aba7389c7a0def98 SHA-256: 872faa9770647b6d5b86e8e3d2b1386cbb67a02f304353e334fa7f2b9283eb49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to distribute malware or phish for credentials. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

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=download+wallpaper+live+android PDF link annotation
    • http://www.sosonomo.com/ckfinder/userfiles/files/34572366918.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/84257451771.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/wanefeligom.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/dopixoxigi.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/bapojitexajewotupigi.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/rupokupexagedivepixiw.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/2162533092.pdfIn PDF document text
    • https://basisangka.com/contents/files/36651637107.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/21839694475.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/59461951402.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/zokiziradadevunajepipuw.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naxovugatulu.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/56781179069.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/2854861826.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fb521ec25---12602602172.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/lovusamupit.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/mupipuwi.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/fomitir.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/jowuwituzadisewizonureje.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/wuvamasufawilifenelarome.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/tufivusoviwegapelikofani.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/fajawokakixudojatib.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/xewikijovurosafofugofuriz.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210908083103.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_off0000b4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE5 17128 bytes
SHA-256: a1a375ac11c556f439efc439dd8ca46d32354fb3617ee04c606e7a10356a9d32
font_02_sfnt_off0000f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 10272 bytes
SHA-256: 8f758054f57364d1b6341a8b660d0d1818e803f4a03ef96ebc21a4b4c6b84da4

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