Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bdced837e7c36d…

MALICIOUS

PDF

116.8 KB Created: 2021-02-03 03:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6c8b4b220069f0ddfd6699052942ba62 SHA-1: f463183de6d8d476c6eae9724efc4043831d8130 SHA-256: c5bdced837e7c36d539f17ed8f3a5c30501a50ee14db80b7f526a12d031867d9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious domains, indicating an attempt to redirect users to external sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a deliberate structure designed to host many links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/123?utm_term=mmpi+rf+scales PDF link annotation
    • https://cdn.sqhk.co/rutunidosaw/hrLifpU/car_crash_in_wayne_nj_today.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483072/normal_5fc5e6592b60b.pdfIn PDF document text
    • http://mbfsopg.com/89409797853cun3g.pdfIn PDF document text
    • http://tokio-2020.fun/14018224507yk1pn.pdfIn PDF document text
    • http://sberpodarok2020.online/xefizugb45n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408711/normal_5fdc6d2d4f6b3.pdfIn PDF document text
    • https://lapadodipelij.weebly.com/uploads/1/3/1/1/131164402/ed149a0b.pdfIn PDF document text
    • http://storezone.info/86946642321kebb4.pdfIn PDF document text
    • https://rejifiri.weebly.com/uploads/1/3/1/3/131380436/f79a1a458e.pdfIn PDF document text
    • http://myimperfectmomlife.com/4660458255598g4y.pdfIn PDF document text
    • https://turoliletipusu.weebly.com/uploads/1/3/5/9/135969349/vujenexo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472506/normal_5fcb5b589ffa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485166/normal_5fef3ffbaa633.pdfIn PDF document text
    • https://kuwumezebuxe.weebly.com/uploads/1/3/4/1/134131528/449f04.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://s3.amazonaws.com/tetenifeme/pewaxowenikatitiki.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/math_worksheets_algebraic_expressions_word_problems.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_off00018001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18001 4656 bytes
SHA-256: 0cb3cc0fa4dc407e2be13dcc513591d37f5ce835528f51afba21ab315a0bc2e6
font_01_sfnt_off00018fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FC4 12088 bytes
SHA-256: 220b15dd57d1c852dd6dd17e88bf54aa373686889657f2c95ae31542b4800108
font_02_sfnt_off0001b788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B788 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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