Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a16488a7e45359c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 22:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: babf6ea2a0c8b61b6f0e7ad52e516e6a SHA-1: 7e837431a066f6c28792b0a8a0f4067b6c8dadcc SHA-256: 1a16488a7e45359c6f7337909cf058f4062fb620d3fa2994ae5e43619fd9e5d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://alcantara.cz/data/file/wemakapov.pdf In PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61470481773.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/84442386303.pdfIn PDF document text
    • http://houselandia.ru/files/melewajafimufaguvevizif.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/ramasaxobipenenigebuko.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/dulaberanaxubeji.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/tajewurerokujuwu.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/7819064663.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/lokamosedu.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210903232732_fl9e5w.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a816894d4---76837191829.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/kimubetutodisefanova.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/savoxepiwewijin.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/wibibaloxu.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/gipokomalu.pdfIn PDF document text
    • http://4darchitecture.org/img/all/kenosagug.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/jumikaxerufavokatebo.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/87186549367.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/migibitegabupotobubufado.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/65273074936.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/36625266015.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/6185991186.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613106e969216---sodexesamufiwitakigis.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/73210246607.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/87781085633.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/70064542073.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/57714190853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=check+carrier+aggregation+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_off0000b684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE96 14644 bytes
SHA-256: 045fbde5df70badcc8688262232053f1b81ec98afb6ea07dca4a2576ed579d8c
font_02_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 10556 bytes
SHA-256: ede2468156030f5bef643bf294a9204c5ddcbe8efa047f4d5c907c28146a8b5b