Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb5f1d6620d709c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 14:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0f67d7758915f377ad2795f3c0c65de SHA-1: 3427d5b63164c3bb82c898c61a2af685c30d8b7f SHA-256: abb5f1d6620d709c2e63dfa62fa2ecbda18e1def929154ce30306a1ad982d733
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious, suggesting it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=things+that+begin+with+the+letter+b PDF link annotation
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/30776615355.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/wojuragibozatupe.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/13694694764.pdfIn PDF document text
    • https://wildnaturetravel.com/File/dakovatafuxiwopa.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/maduregisivixobesisutale.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/pebilevoluzifapapiv.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/jafubu.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210907034814.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/wesowiginugofitopedut.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b45d2b5137---6623797723.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/20446982477.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/55268000500.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/pefobegidiwaxarepowuk.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/molixosopozotodulow.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/24823626869.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/78296540171.pdfIn PDF document text
    • https://granitnet.hu/editor_up/sitojogog.pdfIn PDF document text
    • https://mahae.hu/files/files/6149846783.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/beboti.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613935191b83b---51374674897.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/20784326719.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/pikoka.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_off0000d566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD566 10456 bytes
SHA-256: 8022faa54e82e6c0287a705c67302968e4727842d8ff28d83d90aecd2dbffe65
font_01_sfnt_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 17184 bytes
SHA-256: df9cc1c156fff0802974026b4ec266475fc7cc0994046eeeabb81c673739d4f6

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