Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af68c7f9ab55b97…

MALICIOUS

PDF

76.2 KB Created: 2021-03-03 13:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 314487af1b3d0ec17dabed51f0ed05f0 SHA-1: b864d3e9234b7c7c298004cc6e3a3c984f061d65 SHA-256: 9af68c7f9ab55b978edc0c4db58e68846697fad2a4a655efc9f160afca931ebc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'A little princess book review' and 'wkhtmltopdf', indicating a lure to disguise the malicious intent. The presence of multiple external links strongly suggests an attempt to lead the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/123?utm_term=a+little+princess+book+review PDF link annotation
    • http://gakofanotizukab.22web.org/20_phrasal_verbs_with_sentences_and_meanings.pdfIn PDF document text
    • http://wagagawoduzom.iblogger.org/barbie_cartoon_images_free.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/25639636658.pdfIn PDF document text
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/botironurode.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/cannon_hotpoint_gas_cooker_manual.pdfIn PDF document text
    • http://dududuw.mypressonline.com/hope_academy_charter_school_calendar.pdfIn PDF document text
    • http://beveram.66ghz.com/36814288924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_6020af2fd951c.pdfIn PDF document text
    • https://baxopaparoxiw.weebly.com/uploads/1/3/1/4/131454316/voruxiku_pewore.pdfIn PDF document text
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/wovixu-kosivarizuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384634/normal_600381486f297.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://foraxevub.rf.gd/luvotapogu.pdfIn PDF document text
    • http://boxijekew.atwebpages.com/remington_700_vtr_308_stainless_for_sale.pdfIn PDF document text
    • http://bumelujezi.epizy.com/black_cherry_nutrition_information.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/set_relation_and_function_mcq.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 5060 bytes
SHA-256: 06e422023d0ecb3caa33ec56e46651948d1d266dc69a88e34d28bfb10a603cc8
font_01_sfnt_off0000fd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 11280 bytes
SHA-256: 233d6186f56cb9bedd2e1949562259867bdbebff2b17f683b9f419b50defd3db

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