Malicious PDF — malware analysis report

Static analysis result for SHA-256 831694600a954a1d…

MALICIOUS

PDF

76.1 KB Created: 2021-04-04 20:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8b543ab8268ee83f82b3e6f65bfe9e71 SHA-1: 14e9c84e60295fd0c4004f6e42f37ea291041294 SHA-256: 831694600a954a1d5c5b88f5f6da11496420f51cb275dac9e923e32ac3c21f17
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 0.9998

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://xajibur.ru/strik?utm_term=business+analytics+jobs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392661/normal_5fcdbe1cb30c7.pdfIn PDF document text
    • https://varivupe.weebly.com/uploads/1/3/4/4/134480773/4820364.pdfIn PDF document text
    • https://livesagu.weebly.com/uploads/1/3/1/4/131437401/xobawigiguxe.pdfIn PDF document text
    • https://cdn.sqhk.co/pibutuvopedu/t0ljhuU/pulesevaxadekod.pdfIn PDF document text
    • http://pokavitapizinuv.iblogger.org/genetic_code_transcription.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/Tijejin/auto_click_iphone_ios_13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_5fe77e6cbd215.pdfIn PDF document text
    • https://cdn.sqhk.co/wubejiwixu/ijaqvRZ/a4_catalog_mockup_free.pdfIn PDF document text
    • https://puxosuloboja.weebly.com/uploads/1/3/4/6/134677226/b432c814d95db70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/what_signal_is_ctrl_z.pdfIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_2acdae836841446bbe6e69ed2ecd67f2.pdf?index=trueIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_b51fcf049f3b41ef9dbaa030ab0f1e3f.pdf?index=trueIn PDF document text
    • http://lezefivupeke.epizy.com/93128073502.pdfIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_eed7a4301c0f448baa3edd59f534dc3d.pdf?index=trueIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_6a43968090b844979a99b9df1b4e9646.pdf?index=trueIn PDF document text
    • https://d80f29e5-b60c-4034-b355-14c03cb49cca.filesusr.com/ugd/ff44ec_5b34ed35f01b437fb5e24338f98be082.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/company_profile_indesign_template_free.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_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 5064 bytes
SHA-256: 5c8b9ff07dcb2767f58327a87c139e7a92ecd486a91a1d38eb3c531c42ab8653
font_01_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 11192 bytes
SHA-256: 1e9b350ba0ad028751fdd3cb32e8bae8929536afa54afedc8132855dd0d34055

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