Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6c30bc48bef6f4…

MALICIOUS

PDF

78.9 KB Created: 2021-02-28 12:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d1d13f50b23c0f8b3c4ca62084567bc7 SHA-1: 43de6121f94ba8c7cafd272ade87159d2bd32dad SHA-256: 4e6c30bc48bef6f4ffdc3c862248a1268027ee0088fcda3363f3c739f2535c32
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of many external links suggests the document is designed to redirect users to malicious content.

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://lozipotod.ru/wix?keyword=gizmo+student+exploration+stoichiometry+answers PDF link annotation
    • http://maewallace.com/algebra_lineal_unalmedw3n8h.pdfIn PDF document text
    • https://fozirufimagez.weebly.com/uploads/1/3/0/9/130969558/felami_galeruvibupofi_zajifajozelenam.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/e4115b410bdde5e.pdfIn PDF document text
    • http://shop50off.info/minecraft_mod_hexxit_1.12_2_download6gf8a.pdfIn PDF document text
    • http://hytri.com/23825626511kvdfr.pdfIn PDF document text
    • http://lovechat24.club/buddleia_pruning_guidev7ggq.pdfIn PDF document text
    • https://xigokujote.weebly.com/uploads/1/3/4/6/134649591/5f2bd71c7b11.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/8369202.pdfIn PDF document text
    • http://luchdobro.site/allen_carr_book_free_download6dmjh.pdfIn PDF document text
    • https://xuwupeloz.weebly.com/uploads/1/3/4/7/134734270/bobatik.pdfIn PDF document text
    • http://blancop.xyz/62185224970nea0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gemewepibi.rf.gd/beamer_cambridgeus_template.pdfIn PDF document text
    • http://wijinap.rf.gd/vakukewebavidikavakone.pdfIn PDF document text
    • http://fezaxakanopejux.epizy.com/76787670080.pdfIn PDF document text
    • http://zepakom.rf.gd/apache_kafka_certification_guide.pdfIn PDF document text
    • http://gozewan.epizy.com/manual_unico_de_policia_judicial_version_2.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_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 5656 bytes
SHA-256: d9f937e092323564a9c231ba693b9d081d22860e4540222a034af163613ae103
font_01_sfnt_off000107ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 11152 bytes
SHA-256: 5104338fd96b59d6df5a02650ead75432bafd1709a470113d0abaf489d362e85

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