Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f67aed664fb584…

MALICIOUS

PDF

73.1 KB Created: 2021-02-20 19:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fa67fef2f11bc6ce7a9faca6a37ae480 SHA-1: 81930bd26fb5a42eaaba9c3e4ec4b2e71d0ea6bc SHA-256: 11f67aed664fb5840b69db4aeeeb8c5cbbcde05aeac9cf4887ab046cb144b58e
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, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics points to an attempt to direct users to malicious sites.

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://jottigo.ru/wix?keyword=bank+of+america+personal+financial+statement+pdf PDF link annotation
    • http://trudogoliya.online/color_notes_for_windowste0yz.pdfIn PDF document text
    • http://galajanexagaj.iblogger.org/riwosik.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/xizakoz_gosijikozifob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483591/normal_5fde8677e9d38.pdfIn PDF document text
    • https://wugupuvexiso.weebly.com/uploads/1/3/0/9/130969254/f0d8a370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425255/normal_602971bd201cf.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/dih6Wwu/jetotarusetewudozu.pdfIn PDF document text
    • http://prizinsta.info/solving_system_of_partial_differential_equations_in_matlabunpko.pdfIn PDF document text
    • https://mabatuba.weebly.com/uploads/1/3/5/3/135303696/85eda0a.pdfIn PDF document text
    • http://blaugrana.ru/39164828031lxt1u.pdfIn PDF document text
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/dawisi.pdfIn PDF document text
    • http://medgaj.com/orion_tv_instruction_manual2hhho.pdfIn PDF document text
    • http://autobaff.xyz/binder_spine_template_microsoft_word83rz1.pdfIn PDF document text
    • http://jawigonoputumun.iblogger.org/being_frank_full_movie_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xupudajiwozov.epizy.com/punjabi_university_admission_form.pdfIn PDF document text
    • http://misukejijixuke.epizy.com/mitutoyo_cd-_6_asx_manual.pdfIn PDF document text
    • http://pidezesu.rf.gd/compound_words_worksheets_grade_6.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_off0000e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 5416 bytes
SHA-256: 6db93fac800d38cf0fbc5fd126b530ed435b80b659b837d48f96d49e4bd167f4
font_01_sfnt_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 10504 bytes
SHA-256: 18447f0d366c73683d812dbeed2379b47344998ade3f7df5ac1e3decd85dded0

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