Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7609524de397f9b…

MALICIOUS

PDF

91.1 KB Created: 2021-03-19 03:58:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1f1a45c064168b8d98b65cb698a163c3 SHA-1: 22bc7cbf2c75172207414dd60bc774931c60a95d SHA-256: e7609524de397f9b07a10979c31774dba87136e7f661489084afb6f758d6e4e8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/wix?keyword=emotional+rescue+minnesota PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480581/normal_5fe54aafd604b.pdfIn PDF document text
    • https://cdn.sqhk.co/kakolutezegu/jcichfJ/birkdale_school_sheffield_sixth_form.pdfIn PDF document text
    • http://itawegan.fun/24826122289u45ri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475992/normal_5fd27f43cf0f5.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/j4Hgfjm/xovawotes.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/5pieibi/nipolafatodonokexuxul.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/67637129761ygn2o.pdfIn PDF document text
    • http://woodbonus.net/what_type_of_business_is_thirty_one_gifts8oxu6.pdfIn PDF document text
    • http://avtoshkola-region26.ru/zimojabosigoroz7o89f.pdfIn PDF document text
    • http://legalvictory.group/gubigobam6ceuq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_601b504c65d69.pdfIn PDF document text
    • http://kuviruvada.getenjoyment.net/ace_engineering_academy_books.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/Xjigcic/cargo_truck_offroad_driving_simulator_2020_heavy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mefovu/pavepufimobeb.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/what_is_the_central_idea_in_brendan_nelsons_sorry_speech_token.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/xsl_template_match_attribute.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 4784 bytes
SHA-256: 573fcc6dd3c45fa232a8c7dba42cd93f071be87700c74b4a254536904826d14b
font_01_sfnt_off00012ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE6 10684 bytes
SHA-256: 49402a773e10a896c80f2a8b120ed37993767b7ff8b544523cc3ae300039eafd
font_02_sfnt_off00015138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15138 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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