Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd065c092d87fa8e…

MALICIOUS

PDF

73.6 KB Created: 2021-01-25 18:58:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1722fff543ce079689b7eb449b837a63 SHA-1: 956ef5c7394c2181261c7f3dc1af18f26f5eb5d3 SHA-256: cd065c092d87fa8e80e9ca6cd43e50c12805d923d441a4f2ed680916a3d91854
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristic detections indicate it is a link farm on disposable hosting, designed to redirect users to other PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a scam, by promising a free download of 'Expert secrets'. No scripts were extracted, but the structure and URLs point to a common phishing lure.

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://trafftec.ru/123?utm_term=expert+secrets+full+pdf+free+download PDF link annotation
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/bogopirufabipe_towaxij.pdfIn PDF document text
    • http://golesaluwo.66ghz.com/nimitamikafepiluwizefu.pdfIn PDF document text
    • http://vidclips.design/77167526773s1rjd.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/jgYSe1a/41020801703.pdfIn PDF document text
    • https://rixadoliwuri.weebly.com/uploads/1/3/1/4/131437780/soliralopogu_semuluwux_zonop.pdfIn PDF document text
    • https://cdn.sqhk.co/bolomekurufe/hhic98X/fawiwaverudusuxorakok.pdfIn PDF document text
    • https://raxopukefafifi.weebly.com/uploads/1/3/2/6/132695755/jaxofiwufetovugewebe.pdfIn PDF document text
    • https://bozelisu.weebly.com/uploads/1/3/2/6/132695328/movab_sofetemenemu_pipixubusela_biwuzabidas.pdfIn PDF document text
    • http://genusttwsr.fun/98490650022kub2w.pdfIn PDF document text
    • http://vasowenotaruso.22web.org/pibepamilixuliwawutiradot.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://jatujij.rf.gd/nedizivelanuralopunoli.pdfIn PDF document text
    • http://gorevifero.epizy.com/design_patterns_in_java_android.pdfIn PDF document text
    • http://jupilabezisetif.epizy.com/ielts_report_writing_samples.pdfIn PDF document text
    • http://riwexakax.epizy.com/befuxakesiledipakuj.pdfIn PDF document text
    • http://magikid.epizy.com/nuages_debussy_sheet_music.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_off0000d4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 5100 bytes
SHA-256: af18c09f25487b1659635858d290860ff3153ee3abce9a5e3ad5d0134d0e6f16
font_01_sfnt_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 10924 bytes
SHA-256: e305e2577e9df6674e3b99e971222a6d40e1dab50c8ab5b75a24995e0212f5cd
font_02_sfnt_off00010b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B67 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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