Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d4b2b77a7c7cfa…

MALICIOUS

PDF

74.8 KB Created: 2021-09-13 03:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 34281f7ffbf0ea4e04b0e4c9afccad7e SHA-1: b8976ffd89aef4808bd9ee03c76d84291a844799 SHA-256: d6d4b2b77a7c7cfa006f577c6b235bb442302e1c36fc0f32309532283e4fe359
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also features a large number of external URIs, many of which point to potentially malicious or unknown domains, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nct-vn.com/userfiles/file/zigujimubotunosu.pdf In PDF document text
    • https://theptaynam.vn/upload/files/92384271932.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/difixatepobedakatusa.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366010c4520---nedamunagemupixe.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/40905678468.pdfIn PDF document text
    • http://mutitar.com/user_img/files/53795896655.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/turonumimutebo.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/vutenoluxejesijinunuruj.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/wileroxumemiforizo.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/90402520614.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/13393626412.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021921312286909.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210908174855.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/27066519518.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/nuzunitoxomux.pdfIn PDF document text
    • https://rjpexport.com/files/94577394007.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/11638597116.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/jezibonagakabo.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/zuzigimuk.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/guvelumirap.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/85667079962.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/rixaxa.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/87175045279.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/dapedukiziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=think+student%27s+book+2+b1+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_off0000bd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD565 10788 bytes
SHA-256: b581cf37caf50a4f2275c797edf9da5e28568113d0cbaaf4c897708fe7b238d2
font_02_sfnt_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 18152 bytes
SHA-256: b3a3b67a069be7897f5568bdcb44f48fc4307de4429a237062ab0e3f8edba470

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