Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b73a5288fe05f62…

MALICIOUS

PDF

99.3 KB Created: 2021-03-21 21:25:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 470f84273fa9fdf98b7388e5adcf83c6 SHA-1: 2eceec76e2c689aa533dffc364b084d34a8a67b3 SHA-256: 4b73a5288fe05f62d7f6f82af255cda46923d8814e6c7e4b9ed3a52c0ca04b31
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious content.

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://jumiwimov.ru/strik?utm_term=95+theses+explained PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367911/normal_5fed2616c69c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459477/normal_603c88dc8729c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408462/normal_5fee91e60ea17.pdfIn PDF document text
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/livasafatibesoba.pdfIn PDF document text
    • http://wunadimizurened.medianewsonline.com/1996_ford_ranger_xlt_specs.pdfIn PDF document text
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/2386338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388406/normal_6023d42865ceb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465556/normal_603835b7689fb.pdfIn PDF document text
    • http://com-servers.online/permanent_magnet_synchronous_and_brushless_dc_motor_drives_downloadzovte.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412387/normal_5fe2ac5d5d5f3.pdfIn PDF document text
    • http://rinujajija.getenjoyment.net/negus.pdfIn PDF document text
    • https://lifusapemar.weebly.com/uploads/1/3/4/5/134526201/8e14c91d7222d7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501042/normal_5fe203950b2ac.pdfIn PDF document text
    • http://cmbmarketing.agency/zelda_twilight_princess_gamecube_iso_espaole4atq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_6039b7af9b16e.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
    • https://uploads.strikinglycdn.com/files/1c02d5a8-05c9-47d0-9010-50d2b91464c2/ladofonatitofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d7045c-f83a-41e9-b822-64faf9eaa63b/vewino.pdfIn PDF document text
    • http://penobugixova.atwebpages.com/acrobat_reader_protect_with_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7579fe80-81cf-44a1-8514-24302f898b1f/bible_esv.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_off00013bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC3 4880 bytes
SHA-256: 9e4803a0ac122682e86368f333ef9f1f269600d543d95be1791ae70063348894
font_01_sfnt_off00014c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C50 11540 bytes
SHA-256: 19c131ae1a145f00b705174f0e1a127bbf9cb5f17a09547eda60facf27c242cc
font_02_sfnt_off00017265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17265 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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