Malicious PDF — malware analysis report

Static analysis result for SHA-256 d652550578786370…

MALICIOUS

PDF

81.9 KB Created: 2021-02-11 07:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d548dc113557856eac4da5cc431f8446 SHA-1: 4caf629b9847e26f383b77085009617a6787d9f4 SHA-256: d6525505787863702d6d122f7c1bd609cc8faca63b8d92d2b2f753b3720597f2
126 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The PDF contains numerous embedded URLs pointing to suspicious domains, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to exploit or phishing 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://maypoin.ru/123?utm_term=screamfree+parenting+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393908/normal_5fe2785eba14f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422135/normal_601239e4ebc84.pdfIn PDF document text
    • http://nigma24invest.online/wefawizadizunizumuxemadgg9o9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449998/normal_5fdb7278f0225.pdfIn PDF document text
    • http://karnaval.host/negekitexewakumofq7tw3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_6011b60633b19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455673/normal_5ff803dc37910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_5fe89cb82b399.pdfIn PDF document text
    • http://mscredit.info/characteristics_of_linear_functions_worksheet_answersupgpa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470400/normal_601dcee048b72.pdfIn PDF document text
    • http://duplicwcnj.space/catholic_answers_cruise_2020j947f.pdfIn PDF document text
    • https://cdn.sqhk.co/nenafodud/geLMiYJ/othello_plot_summary_sparknotes.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/91ieijC/melaregeguduwetunuzu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/noviwib.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/comfortsense_7500_user_guide.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_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 5368 bytes
SHA-256: c32c5d12cf1ab89fd33034a17ee5bb81f3621f124bd4e9f6fea4b85c0ed245cb
font_01_sfnt_off00011516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 10928 bytes
SHA-256: 39b65998306bb103c146ff3e197ccb35bf2582fbf3ce52df9554c0c1d81bc83d

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