Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa580e2efd4e896a…

MALICIOUS

PDF

89.8 KB Created: 2021-09-18 17:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e22bd239d9d107391a23b5615bd8dc8d SHA-1: 8e8ab6a15c1ff354ed0a5ef13a5dbe6789e4e2ec SHA-256: aa580e2efd4e896a182e9997afe4e50561b08adf0f6e051e335ae97507ebe066
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs pointing to disposable domains, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using numerous links on low-reputation hosting for deceptive purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://allytemp.ru/uplcv?utm_term=dance+plus+season+2+download PDF link annotation
    • http://lahma.pl/_u/userfiles/file/xogojanetoluxojono.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/pofiwikifovipuwopab.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/lejedamofolelogifozo.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/xalagapinime.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/gapetapigevigisogesasi.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/gimagefamiku.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/fadoluzalexu.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/52408945852.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/sudixaweteki.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/13536370150.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/36415205303.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090422423973499.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/sisoxodisobak.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/4117520032.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/2320603352.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/54712340681.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/43081380910.pdfIn PDF document text
    • http://agavietnam.com/img/files/xezenoduto.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/giwopebibufodosov.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109130754104243.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/boduron.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/qlkpqs5j2ia8123sp1eqgq5jkp/suwuroxometim.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/59452608402.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/3246277101.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210915202511.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3e4aabecc---nuxujipe.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_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 10524 bytes
SHA-256: 94f6d06c96afb3efe3f6871c7fb210d74c26fd0a4f26f136684e01af1613a8eb
font_01_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 18684 bytes
SHA-256: f96f0114a6737720a0cdd8fb0e2a95af7ddd9f127246a8573901d11dfcdcdc56