Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fac28c1a5f5e763…

MALICIOUS

PDF

75.8 KB Created: 2021-09-10 23:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82c97deb438d7ddc9a89b47ed1ee3500 SHA-1: 7d0a27ef206b95ba5a0ee1474f4983e890927e0b SHA-256: 4fac28c1a5f5e76349b96fe628caa23c098cb810e45cfa43ec97172e403a5afb
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a strong intent to redirect users to potentially harmful sites. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://garglob.ru/uplcv?utm_term=b+tech+1st+year+physics+lab+experiments PDF link annotation
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134159f83e1b---42467664797.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/25321078527.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/nezadawunijakoto.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/89034443990.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/xemaxefuvoxugo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/munirofadarijixare.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/3269725315.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/26987775039.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/duruf.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/jutovoxexasutelaxapaf.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/pupowizazifiro.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/fojefepamisitosazesoxo.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/35626822422.pdfIn PDF document text
    • http://poliinc.com/upload/files/21019045155.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/55698558696.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/jokotalepafuzabebepanezud.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/98516919702.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/zavajitapozujixumejanisas.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_off0000c23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 17904 bytes
SHA-256: 2612058cc775f6e3aa80a8a79446a275b4c6981741a6a3e546afd9feafd85e5f
font_02_sfnt_off00010916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10916 10980 bytes
SHA-256: ce9ae1e80cc6ba6a6c9c3633d9fce9c8237ae6e8cbe61a2651e5de5c0c2985b2

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