Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b12681fa032e777…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 08:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee9ae31b8b2557d834f4d8eb1216d72d SHA-1: 4afd0e8c9c684f14901d70cd1f24f3072392ed06 SHA-256: 8b12681fa032e7774ae3e689667f9cc95afc8bf7010d2d644b32c0c4852f3992
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, one of which is a suspicious PDF file hosted on 'putnamtaxi.net'. While no scripts were directly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b70b65e6e9---vejagasejago.pdf In PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/89114615911.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/lokukegopurazasifotava.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/xigovabuvomudedalimu.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/jitepabuxofafoludinewomo.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/miket.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/vezawawikenitapifaluvupek.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/69349519624.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-4/20210904054938341219.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/luwimawup.pdfIn PDF document text
    • http://hinodanang.com/uploads/image/files/56836520267.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/rolovax.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/sudafajiwimenise.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/8546604555.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/pijirozuzonudumi.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/54078442518.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/81971827289.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56464202627.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/mogedijigumodelajiv.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/11703846194.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd7fd585ecfdfb81e99bbe9ab32f460d/gowovenobebiwubako.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/83834408096.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/xakutojevojuganirizumuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=assassins+creed+origins+pdfPDF 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_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 10632 bytes
SHA-256: 7ce33380247a20c5588485555e544ea0613491e0df892c4dc8231d3d368e4f2c
font_01_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 18640 bytes
SHA-256: e950e86789ed472d81daecd81c09269dda3a0d6bfe34edf9bccd9691d47a4f93
font_02_sfnt_off000121b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1