Malicious PDF — malware analysis report

Static analysis result for SHA-256 a751d7236f075680…

MALICIOUS

PDF

79.9 KB Created: 2021-06-07 00:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5c82514e084514bb5443f7a426b44636 SHA-1: e58fd67b9dacf61ee5ae2e1810a5c9fdd85a5ab3 SHA-256: a751d7236f075680949c899136f877705087ed46b85897f5c96ba617afe65851
126 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/pbw?utm_term=ielts+listening+test+7+tourism+survey PDF link annotation
    • https://xitokudid.weebly.com/uploads/1/3/4/6/134688137/2034983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445881/normal_5fd9602e47943.pdfIn PDF document text
    • https://jaxuvoxet.weebly.com/uploads/1/3/5/9/135979876/zonotavosu_ladawipezamew_tuwuvejib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_6047def4d0e6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365551/normal_5fc7f9f1c4051.pdfIn PDF document text
    • https://vurinilobato.weebly.com/uploads/1/3/1/4/131454355/9d49d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379485/normal_5fcad5d116d1b.pdfIn PDF document text
    • https://tabolobaw.weebly.com/uploads/1/3/4/7/134744426/nigad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vosebim.pbworks.com/f/20497834934.pdfIn PDF document text
    • http://pimepovume.pbworks.com/w/file/fetch/144481098/mortal_kombat_trilogy_cheats_pc.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/f/66066764291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e37e19c5-f431-47d5-b24b-99d19dbb777f/27150055685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/545be0a4-35c2-45ec-a349-e5fb29a5947e/56199396504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51020e60-f193-42b0-9969-35897c616236/10.4_practice_b_geometry_answers_big_ideas_learning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb70532b-2d46-4d85-abd1-b680e8d4e957/66207215142.pdfIn PDF document text
    • http://refarumiba.pbworks.com/w/file/fetch/144600408/3377838473.pdfIn PDF document text
    • http://pefumugat.pbworks.com/f/what_is_the_difference_between_1010_and_1020_steel.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_off0000fe73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE73 4976 bytes
SHA-256: 2a0319df90b257bba7a68eb15f0e388fb2e9afcb28a03e0caf118bfcd0757611
font_01_sfnt_off00010f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F64 10280 bytes
SHA-256: f5e8ece04d9e174defb2cedf68e7b90790c4298d52671be414ea5b8bebc4d635

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