Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1afbff71446bb4…

MALICIOUS

PDF

69.5 KB Created: 2021-09-12 05:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 706856b8bd2d58bf07e2f529fc44e14e SHA-1: 4aefda7dfbdc08e6578cf5ddfbf8d36e60291deb SHA-256: cc1afbff71446bb4cb6b6448525210bf70b8ade6a57c9014e614bdb39a7a329e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files, indicating a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these linked resources. The presence of multiple unknown URLs suggests a broad campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/83071848093.pdf In PDF document text
    • http://tdbakademi.org/userfiles/files/zerijizakegujid.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/40900460750.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/toduseturamawigibo.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/nasifajepaxifomu.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/xuridabanepitarakave.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/rasidoruwikoxerovi.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/56175801848.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/tewaxasijepojapulu.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ralokibazafut.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/wupamutizosifimujodasuzef.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/besive.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/82980146196.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/dawodemaronuwu.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5a582c8b4---loguxakiwo.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/kodulonu.pdfIn PDF document text
    • http://alptw.com/images/files/96076651839.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/pumosamidusuza.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/vovasunowadodipujananuw.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/kafagetopatodelig.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/26834789342.pdfIn PDF document text
    • https://msiutilities.net/documents/24818865054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+if+i+restart+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_off0000b21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA32 10684 bytes
SHA-256: 5725277a321aea5c0a45b1e413c283b0b5d23f4593c00ee0d6fea2dd77db1593
font_02_sfnt_off0000e291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 15280 bytes
SHA-256: 43ea8dc57b0abfc1aa59274e17ba82720d11b9ae458ab7b0b35e63b849525ec1

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