Malicious PDF — malware analysis report

Static analysis result for SHA-256 52895e38336260cc…

MALICIOUS

PDF

72.5 KB Created: 2021-09-21 00:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7309d50f86140d8c1732e9692d94e701 SHA-1: 931cc744ed5f4233e78d978a195c48ca0cb25d51 SHA-256: 52895e38336260cc9088c8a8424c1a16268ee0e14b6fbd451f64eb6d86dd4210
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links to external PDF files hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of JavaScript and external links points towards an attempt to exploit vulnerabilities or trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://machi-tomo.xyz/js/ckfinder/userfiles/files/numijekudafinigoxujasowir.pdf In PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/kugubunekizadup.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210905_0DE98CA8D4B6578B.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xawebagov.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/15740840228.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/kukepuzenivekomufapo.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/vufanat.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/pelomeru.pdfIn PDF document text
    • https://bliznacite.com/files/22682777714.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/23824272992.pdfIn PDF document text
    • http://ropesadventure.com/d/files/gejovovonelofip.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109160258356125.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/90491918857.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/dovafulododasemewukumaf.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/95563983261.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/tekejuj.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210909171109.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29d32db1c---neditugezajepef.pdfIn PDF document text
    • https://lesura.net/userfiles/file/jijuxefufinime.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/59448452325.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/teponalesilegokuvinov.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210906_D000662F2128F763.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/gifegoxen.pdfIn PDF document text
    • http://fgosvo.ru/files/files/tegamorizesenutete.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/vegoxugamuxegexewax.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/29652443264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=own+number+androidPDF 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_off0000bb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB38 16324 bytes
SHA-256: 63e5a50b7fb6dafc5dfc472d12b94b892c6ffd717206a26d8a80c87c1b787526
font_01_sfnt_off0000e4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AE 10448 bytes
SHA-256: cfa74be00d8a33460ef24a69394b97e2fac16db1f55ac083941c4cf0ac9cfc73
font_02_sfnt_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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