Malicious PDF — malware analysis report

Static analysis result for SHA-256 84088265f0956ffb…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 06:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f443399c27c5c53b75f340d29903af95 SHA-1: 2df79cfadff104ff58b98baa8833f5743906d007 SHA-256: 84088265f0956ffbaa60aa66810485241fe8a4680dc079dae9145592e57fe259
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://chinajnbt.com/images/upload/File/sutokalenonawodija.pdf In PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/wogevavesutilaxasukakap.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/resumudoripax.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161302a4d62e09---puvudebisadu.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/disigefufanogoku.pdfIn PDF document text
    • http://ahchala.com/img/file/gubevexapuw.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/xewexado.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/76128404944.pdfIn PDF document text
    • https://digireg.cz/upload/roxexozo.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/20726165924.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/gepupoke.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/ladozitabajix.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/56934566173.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/23106589827.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/72419513020.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb1d364c2---jesipi.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/demajifijerirog.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/29907932987.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/kibejupotegin.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/tavuwirojamuzi.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/fumiguzotokemupapofepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=does+android+have+imessage+equivalentPDF 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_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 11008 bytes
SHA-256: e6dbd46d70869ab1190491420f8422e31eb93228d265f0e8c372f7fa043abbca
font_02_sfnt_off0001102e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102E 17820 bytes
SHA-256: 4324fd4fafb04baf13fae085b6d0c2b480091cd46a5f1d1c16b11eb9ee48765e

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