Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9b08cad415dd25…

MALICIOUS

PDF

95.5 KB Created: 2021-03-15 10:23:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bb3036ab240c8d52b3b12f41bc4d1f13 SHA-1: bd5826dd2c4a5e0bffe12ccc810d7f4ec1eba494 SHA-256: bd9b08cad415dd25040b95ac553643a2b2ca6baa1359118ec79d90a4b710f7a0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing or malware distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://dugedepap.ru/123?utm_term=amesbury+archer+ks2+worksheet PDF link annotation
    • https://cdn.sqhk.co/kujexelorite/Hhhz1iI/disaster_alert_app_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450732/normal_6000cd2a4b8de.pdfIn PDF document text
    • http://javaxirivibewi.mygamesonline.org/debitu.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/hifSsja/ximususadulotorizamutis.pdfIn PDF document text
    • http://wifoliku.iblogger.org/pioneer_super_tuner_3d_specs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479462/normal_6042e25c339ef.pdfIn PDF document text
    • http://tamakedesununod.mywebcommunity.org/kavobiviwusovux.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/how_u_say_it_will_be_ok_in_spanish.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/61188297322.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485157/normal_5fded58ad6b74.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/95039122454.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/bekukimigaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477638/normal_6044708668f0b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bufarudewigufeb.rf.gd/14249926481.pdfIn PDF document text
    • http://newepizudef.atwebpages.com/cat_books_online_free.pdfIn PDF document text
    • http://wiwawilif.epizy.com/72789891657.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/wudizijel.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/saxejigufas.pdfIn PDF document text
    • http://rorizupoduvu.epizy.com/80844302084.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_off000135b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B0 5524 bytes
SHA-256: e6878ec522368059b17a6d78ddf97089e048f8c58633bc1717983d44055cec17
font_01_sfnt_off00014866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14866 11412 bytes
SHA-256: df5f59fdc4c227fb70aded720b228d70e452042e98baf8899dc17a2bad796b1d

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