Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb126e137ed37cec…

MALICIOUS

PDF

89.0 KB Created: 2021-09-14 16:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33475d42fe2ba50b2cd85f374e318b2c SHA-1: 02f80e65339b0f0721accc3b1f9131d548274481 SHA-256: bb126e137ed37cec96071d18bfc1cd9c323f83df4a8a44091a7187f69c50e52a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are on disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of external URIs and the ML classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://wastran.ru/uplcv?utm_term=file+manager+with+hidden+cabinet+apk PDF link annotation
    • http://imosa.asia/uploads/files/202109141144388255.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/nigukajalejobizigu.pdfIn PDF document text
    • https://diphong.com/uploads/fuxawisi.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/doditog.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/40872507320.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/pifetazukoruxine.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613feae1762ec---xugedefuwaxi.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/74423286426.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/91904669100.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/5775434643.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/waxaduxateviduzobububizad.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/53053839710.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/42679303395.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/95177958752.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/jupawuzunimivuzagonevi.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/saliwakatogenobibalugev.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/gamikixujobinegetakibo.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/vefamisudep.pdfIn PDF document text
    • http://tencanpowder.com/d/files/vajepesubarizil.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/nasajiwadotajuvopikomemut.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/zixeniwinerijaresi.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/26369947246.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/jusugilekunatekamebi.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/32625705345.pdfIn PDF document text
    • https://foulardfotografando.it/file/72448116419.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/75061118049.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_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 19180 bytes
SHA-256: 35481c36c192ee453a766de6c3c7b43566cba9b6a9aca83e8936f98d38ae741f
font_02_sfnt_off00013dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBB 10968 bytes
SHA-256: f611a80528b6cf70d2725fd6f30f0457da04774a523ddc727bdb85f49225e8e7