Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53b54221f45e3f7…

MALICIOUS

PDF

86.9 KB Created: 2021-03-14 03:07:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1fdd1235cef9b3c77a1389b2ca6c769f SHA-1: 2f5b716181cce36ce540542b532c67208aa76e5d SHA-256: c53b54221f45e3f7bfd2d7d1e97661345f5c864b16104b6de03f65c666b1063f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary URL, https://druttle.ru/wix?keyword=ap+biology+chapter+4+test+answers, is likely a lure to encourage clicks on the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/wix?keyword=ap+biology+chapter+4+test+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369308/normal_60043fa901e2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467915/normal_5ff76874a1065.pdfIn PDF document text
    • https://cdn.sqhk.co/nagubeze/gwXogeb/sebibet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460243/normal_6030245d304e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419413/normal_6040586d12d95.pdfIn PDF document text
    • https://cdn.sqhk.co/sutadejuna/XgdoExr/surif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_42c74267b2a34d518fe176e5ed65004f.pdf?index=trueIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_4a725933e3604d61bb396e173d1268fa.pdf?index=trueIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_8ff408d7b4b54646a2dfc605676969d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c84cec3d-0862-49cc-85eb-6c26fddff5bb/54273697034.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_db11abd1a9364e2dbec2b7afe37b1957.pdf?index=trueIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_69bd9f066c3540059c21c658017fa186.pdf?index=trueIn PDF document text
    • https://f270a619-8d23-4dc9-95fa-a4320df4b75e.filesusr.com/ugd/7bd364_548de43a5994408888f70fb8c11f32ab.pdf?index=trueIn PDF document text
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_61c504617e9f4f48b3d230c707d1781d.pdf?index=trueIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_b4b69d92b3304fb6a149290cefaf67ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e62823-08af-49ac-b726-5dec52c9658d/draw_for_dummies_free_download.pdfIn PDF document text
    • https://13006a6e-9b3f-4191-9e3f-064114488741.filesusr.com/ugd/34464a_a31f3a2fbe174d429ca898997dffb574.pdf?index=trueIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_278c24a0b98844128736dde5e396d281.pdf?index=trueIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_3f405131816d4df999a74652bcda4894.pdf?index=trueIn PDF document text
    • https://fb1cd387-549b-40f1-a5a4-67fd65d29bb3.filesusr.com/ugd/4200b4_19102720504b45d7a7bc7976bf1ee007.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_8a3fcbeebdab463890c7ab1e16ea8bcc.pdf?index=trueIn 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_off00011572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11572 5608 bytes
SHA-256: 57e079f6295582ee936772b36a858725992d6ee0147b5eed4d47b76d8a1c7cd7
font_01_sfnt_off000128a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A7 11056 bytes
SHA-256: c96c2c1f97a15134c376aefc8bb292819f486c21eca06caa37d3eb8e701ac3f6

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