Malicious PDF — malware analysis report

Static analysis result for SHA-256 571b76d20697c633…

MALICIOUS

PDF

83.8 KB Created: 2021-03-19 01:12:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e610aec37460a64115ca1a0f6dabaf87 SHA-1: 9bb3ea1ee3fa1da9b481947a3ecc5c5f4ce3b178 SHA-256: 571b76d20697c6337bb04b85e2b5b2a685fd61370689c1e7a7d00185f7f0690d
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or phishing for credentials. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://kuzutuzo.ru/wix?keyword=the+invention+of+wings+study+guide PDF link annotation
    • http://libertinemodels.com/dafobepaparijixedirokub473wj.pdfIn PDF document text
    • http://stassikorskyi.com/how_to_set_up_xfinity_hotspot6o6qu.pdfIn PDF document text
    • http://leniwatojetojem.medianewsonline.com/the_yoga_cbt_workbook_for_anxiety.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_6031e134c7b06.pdfIn PDF document text
    • https://jagewimaw.weebly.com/uploads/1/3/4/0/134012974/534472.pdfIn PDF document text
    • http://loziwazekon.medianewsonline.com/xogamewexaviwuninimixuna.pdfIn PDF document text
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/96cc566.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/31840930233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454803/normal_604e3485c6d74.pdfIn PDF document text
    • https://sulekigotama.weebly.com/uploads/1/3/4/3/134307446/vemas-bidibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497650/normal_603ccdc68ba51.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://nekelaxowe.atwebpages.com/85970306891.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/c._a_course_full_information.pdfIn PDF document text
    • http://napepezubebefiw.epizy.com/joining_report_format_for_central_government_employees.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/96572496768.pdfIn PDF document text
    • http://vaburarixalota.rf.gd/4l60e_transgo_shift_kit_install.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_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 4916 bytes
SHA-256: bde75a658b423284d646fda0d3115e57304187e5bb878b15c3d59e3004d6b1c8
font_01_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 11232 bytes
SHA-256: 55a421166260977bb9ea0c23aad26d3021cf396d95e8f332eb0a0413d20d4049
font_02_sfnt_off0001329e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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