Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb4278d9e85ba7f…

MALICIOUS

PDF

69.9 KB Created: 2021-09-15 11:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c45dd803ea560364bb3d4d08ac8629fb SHA-1: 7c4aadd0aee09a857ab89be6633505e1f3c3ea26 SHA-256: dbb4278d9e85ba7f6c16356c419758d13813ba13d30b4b1a7d7d83f7c542e045
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://allytemp.ru/uplcv?utm_term=the+escapist+apk+2 PDF link annotation
    • http://utcsp.rustyramone.com/uploads/files/xafesimewitujuke.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16140806828226---68503323885.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/bubudazujizipidudafoza.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/86061098289.pdfIn PDF document text
    • http://njxinbell.com/upload/files/tabowutabe.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/87529576441.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/monotezeboxebuzabaverupag.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/vanuregod.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/12870534253.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/16190515115.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210914135524.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/xovaza.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/35307690824.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/toxegowagaturitovekeduto.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/zexuwozu.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b61b76610f572728ac35a5544b536c5a/gebederitobe.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/18296695890.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/towinaxejefujamatekuw.pdfIn PDF document text
    • http://caythuocnam.org/images/files/pefosun.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/nodapijoratilekokeraxu.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/xizoziges.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/nivux.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/fukus.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/kejuwekixogotepamiluboxep.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_off0000b5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C5 14920 bytes
SHA-256: 52e3e76096b63630e1ae6a85bf990b0f60af72be9d7719dd3cd5310cb6738ed7
font_01_sfnt_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 10276 bytes
SHA-256: 68583cba2266b64d1b057fe7575944e1f62c44d9a56a8311b7f51c1ff77fb723
font_02_sfnt_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1