Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa8e38a3469d876…

MALICIOUS

PDF

69.0 KB Created: 2021-02-18 10:18:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: c91f34dc85d167883c11a17b3ca76e2b SHA-1: 529b56eb3538ee3f23abfdec49d9df9707b5b43c SHA-256: faa8e38a3469d876101e15237866b84e557db5a2d7956b87f39ff82077d1d56a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links pointing to disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for exploitation or credential harvesting.

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://leonvi.ru/strik?utm_term=lennox+pulse+furnace+spark+plug+gap PDF link annotation
    • http://businessmentality.com/bbc_iplayer_s_disappeared7a3za.pdfIn PDF document text
    • http://prizinsta24.space/twilight_saga_eclipse_2010_full_movie_online6qi36.pdfIn PDF document text
    • https://zatenumidepav.weebly.com/uploads/1/3/0/7/130776458/4714730.pdfIn PDF document text
    • http://jenupekob.iblogger.org/ynw_bslime_slime_dreams_free.pdfIn PDF document text
    • http://sokfresh.fun/exercicios_de_torque_e_alavancagxs7a.pdfIn PDF document text
    • https://liruviwogaralo.weebly.com/uploads/1/3/0/7/130776788/a5f11dc12bd9e7.pdfIn PDF document text
    • http://lakulikelanu.iblogger.org/difutoren.pdfIn PDF document text
    • http://feboxazatoran.22web.org/wodixaretupejaratakiko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://peburameg.epizy.com/answer_sklep_krakw.pdfIn PDF document text
    • http://mugudupo.epizy.com/asco_sep_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/central_and_inscribed_angles_worksheet.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_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 5256 bytes
SHA-256: 64f3aa86fc556b7ac7732d7b1f1896af2c084070b625fcd2da8d799f84b84c7f
font_01_sfnt_off0000e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 10300 bytes
SHA-256: b799cc19e81a938c67e3b6ff4c750fbb3298621b7eda87b2afce6c9512789f0e

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