Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f52f4b8da0cbd4f…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 08:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f71b6470c4d6e810cfed0e0b42308934 SHA-1: d98ca0184d8a500a6badaae7079ca04e76231cbf SHA-256: 6f52f4b8da0cbd4f662f049bbedafa21b48053184f0325fc4233681f74f3cb6a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, indicating a phishing or malicious redirection attempt. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating malicious actions. The numerous external links suggest a link farm or redirection mechanism to deliver a malicious payload, consistent with a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/uplcv?utm_term=tanks+trouble+2 PDF link annotation
    • http://kovospm.cz/fotky/file/25245584945.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/ziwilot.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/sasolewikokowukoxodudofun.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/fosobovafonorutugo.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/felusuvisewawibi.pdfIn PDF document text
    • http://abworder.com/uploads/files/48353370906.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/26329134712.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/60581871967.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/pobel.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/selutekigunewapakofaj.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/35749801983.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/dojegozakesunax.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210903_7D35575E37D77D96.pdfIn PDF document text
    • http://chinahongji.com/d/files/10027985587.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/pupedisikegolakolapujiweg.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/kijubezovigutu.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69403588232.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/namifosidetejenozakobatir.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/megewexixorekiwegati.pdfIn PDF document text
    • http://pronobile.com/catalog/file/89482015162.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_off0000ae50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC667 10424 bytes
SHA-256: a6941e11a31f4967ba2b5fd1a43a68f0f9e594892e1c7edcb70804ef23cd0c17
font_02_sfnt_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 16584 bytes
SHA-256: f9ad1ffc88202d786159dad858c6e1e9d28b0d163f75d1079ac6d2d816ef6bec

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