Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdee93b892e9a3b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 08:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bed65441c9f1d7838b55f94b4ddb7a3b SHA-1: 3b6d5e6e89071a003da1bdfb008e6aaa2e036004 SHA-256: 5bdee93b892e9a3b17e7914ef2546bf224dcbb86369941f04acf9e550dbdac40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and configured as a link farm, suggests a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://imobilestore.de/userfiles/file/78801835383.pdf In PDF document text
    • http://norilskgu.ru/userfiles/file/79848261474.pdfIn PDF document text
    • http://tdbm.vn/upload/files/taludaruxedudenu.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/vitukupos.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/86315714423.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/pamumawudixivef.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/dixibe.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/86106839914.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/36665765159.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/40735158998.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/42090653594.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/foleg.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/35065722605.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/18723302380.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/16166873847.pdfIn PDF document text
    • https://premiersuli.hu/files/files/repawotiji.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/61850505476.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/bekikimaniziwefabi.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/bukimogisazewafipajuboju.pdfIn PDF document text
    • https://fasleh.net/Files/files/xezezelukavolis.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/60558223674.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/83426174254.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/56437630371.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/45782187223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=do+i+have+mirroring+on+my+phonePDF 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_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 10568 bytes
SHA-256: 2610da81178237e3ae585ac5cb7d752f1691ec347c9358f3277bb3be83024364
font_01_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 17892 bytes
SHA-256: 9b9b65b1f865c8c754d5ccf3d89bbe59b6c1eac03ab14de84899ccc5dce6b6f9
font_02_sfnt_off000121ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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