Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdd43dc9300b8c0…

MALICIOUS

PDF

117.2 KB Created: 2021-02-24 05:05:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 92c3bbf43a92d4a9547830226756c220 SHA-1: 087e381ee2e60c7488bb960c935a20d83accda18 SHA-256: cfdd43dc9300b8c0f68c5a4c0f67e04cb1e4a8975454c2d01812696f320259c4
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to potentially malicious or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common tactic to redirect users to harmful content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=elephant+seals+fighting+to+reproduce In PDF document text
    • http://fruittea.space/riwatujizubqxcq4.pdfIn PDF document text
    • http://it50disconto.info/rafegofonanivosugexow651p.pdfIn PDF document text
    • http://poradoit2.site/convert_action_file_tosup0s.pdfIn PDF document text
    • http://ejinaya.com/xededud6mp6.pdfIn PDF document text
    • http://mail-autoscout24.net/80479435709ky7z6.pdfIn PDF document text
    • http://startask.ru/count_and_noncount_nouns_worksheets_grade_4kpvzr.pdfIn PDF document text
    • http://tuimag.ru/328679819707a3tm.pdfIn PDF document text
    • http://mandarins.space/baldi_dies_mod_apk7z8n3.pdfIn PDF document text
    • http://freedate18.xyz/753485382000ny4m.pdfIn PDF document text
    • http://milanomodaitaly.site/clases_para_adolescentes_cristianos_evangelicos2o2ot.pdfIn PDF document text
    • http://magnitoli-2ekran.site/besame_mucho_alto_sax_sheet_music8kl31.pdfIn PDF document text
    • http://1xbet-registr.site/ziwupic2p9m.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
    • http://xaviwawav.epizy.com/wajofeguwasozotulaxugagim.pdfIn PDF document text
    • http://zejimuporuje.epizy.com/48145687482.pdfIn PDF document text
    • http://nawatelobuj.rf.gd/beast_boy_titans_transformation.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/mastering_physics_answers_chapter_29.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_off00017846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17846 5256 bytes
SHA-256: b7d8995a517d37b406038d6e1131d9239b8e51e52dbfd1bdf886439ef9655baf
font_01_sfnt_off00018a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A14 15076 bytes
SHA-256: 24e7c0eec8e8a559dd009bd5c4c00240f8ff0e7365c6c84a57d573d9a35e71a6
font_02_sfnt_off0001b92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B92F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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