Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c36de2e4bd7d22c…

MALICIOUS

PDF

76.6 KB Created: 2021-09-18 11:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba440c84f354346e189af48c05769084 SHA-1: 100d0fbfcf65be7ffa45056957aa46b42230c58a SHA-256: 4c36de2e4bd7d22c04313140d2c722167c5c1aa7edef78fedda5ecbc4e0ba432
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, noting the presence of UTM parameters suggesting tracking or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://irlanc.ru/uplcv?utm_term=watch+jurassic+world+online+123movies PDF link annotation
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/73lqlhreef1fpkmo0ud9rg51te/32207955506.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/nizanenoxitopu.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/tatolozorumax.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/boxeri.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/83251721233.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/vamawafazatobuwafogupigi.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/76763519361.pdfIn PDF document text
    • http://foodchemsino.com/d/files/38084149595.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/63175397825.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/zoxinusijixufadipud.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/87562426413.pdfIn PDF document text
    • http://stl-hk.net/userfiles/bolukub.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/63879570340.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/21764998994.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/sevonegofom.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/bokixatorejuf.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/jaresoluxeka.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/86255515659.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/97765223537.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091314203673499.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/demurirujodajebuvaf.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_off0000c424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 17848 bytes
SHA-256: 3e2bf7eea2841a8ff0896556aabc3dd65883eee7053b29b5f1ee2c4f3f3381e9
font_02_sfnt_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 11352 bytes
SHA-256: 4d0b4c519d57681c7726717997386ae66fd9c9308b8fee896a5ac2109c6e0a97

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