Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ca8d68b75dc762…

MALICIOUS

PDF

68.9 KB Created: 2021-09-19 12:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 03fc91860dacd0a5bfe00668eaba9b20 SHA-1: 299bc712d3282d5b19ae92100ad8994130d297fa SHA-256: 56ca8d68b75dc7628d7b8932bf330d30f347ce1c59335d00df72e9b29efe4387
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct domains, one of which is explicitly identified as a potential link farm. While no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://ybshajiang.com/userfiles/file/2021-09-19/210919012514019272wgpgrzuf2i61.pdf In PDF document text
    • http://elite-nails.pl/Upload/file/41486222648.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/vubupesapapizuj.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210918062921.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7bcdd3fa4---vakojonami.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/nojetekoragezilezexe.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/fojopemokexivijalojo.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/35969519711.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/29853618782.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/71000878114.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/kepadupomezibezovakuwe.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/85803844998.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/29465808908.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/56016463277.pdfIn PDF document text
    • https://senfina.top/uploads/files/40867705807.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/54673778009.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/vujixafigozup.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/padosanemufije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=vidmate+illegal+app+downloadPDF 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_off0000aef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70B 10520 bytes
SHA-256: a30d520f4041fa898a23441884823c80f674eabfd57c94e16726ebd3b2d6a004
font_02_sfnt_off0000dec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC2 15836 bytes
SHA-256: e3245e8e99bbd29dddc671294d0d141223ddf2cc2319194f692472488d8f1965

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