Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df6bec3fa6174b2…

MALICIOUS

PDF

74.3 KB Created: 2021-03-20 06:24:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 76d0167fd6ce577f767bda301124559c SHA-1: 538377f3e281995bafe34822755a3b573024f2da SHA-256: 5df6bec3fa6174b2686fdcf2e5138674fb9c391e7939ebef143449293227b310
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://resalured.ru/wix?keyword=ancient+china+webquest+answer+key PDF link annotation
    • https://tusuwijajibu.weebly.com/uploads/1/3/4/5/134517525/31922c46f89.pdfIn PDF document text
    • https://pevarigemi.weebly.com/uploads/1/3/5/3/135303959/ccbb6.pdfIn PDF document text
    • http://armlur.space/definition_of_pestel_analysisdn7pm.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/nojipituk8xog1.pdfIn PDF document text
    • https://fegemuvu.weebly.com/uploads/1/3/2/6/132695633/8817963.pdfIn PDF document text
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/64176292bdb366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_6015c0e76e205.pdfIn PDF document text
    • https://bugituwixumanuz.weebly.com/uploads/1/3/4/7/134722584/feae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_60133f58b9528.pdfIn PDF document text
    • https://xobisajak.weebly.com/uploads/1/3/4/2/134234638/cf2b75e129.pdfIn PDF document text
    • http://spainsale.pro/what_is_project_management_softwarezm0k8.pdfIn PDF document text
    • https://zunurevupuvofas.weebly.com/uploads/1/3/1/4/131438471/2f7357b105aa1a.pdfIn PDF document text
    • http://9gusevshop.space/88022467205axi30.pdfIn PDF document text
    • https://lovarewido.weebly.com/uploads/1/3/4/3/134322716/6001736.pdfIn PDF document text
    • http://study-english-05.site/presto_pressure_cooker_canner_partskzb3c.pdfIn PDF document text
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/7ade116fed27d39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_1111365c65c846e8b222af36e5756e1c.pdf?index=trueIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_59dc6a38e8aa4df5b92393fd922ca8b7.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_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 5368 bytes
SHA-256: 4d7d5bc83aaf23f23f92fb2a345a972cfad96e39514cd979544ae746978f4986
font_01_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 10996 bytes
SHA-256: 0f3f1ffbf3902a9ce51724b7cf93e31dafce5644f79e03844510f4f73519a52f

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