Malicious PDF — malware analysis report

Static analysis result for SHA-256 58da5b3090cca234…

MALICIOUS

PDF

88.0 KB Created: 2021-05-10 22:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b5727258730d97be547197928a93d49c SHA-1: 976d31b097de52a015820e4d5aedfc6b55c4c586 SHA-256: 58da5b3090cca2343279fa981a314f14a3e78a6a5c4cfc34ecdfc9bb281b73bf
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/strik?utm_term=artscroll+siddur+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371266/normal_5fff1afbf1740.pdfIn PDF document text
    • https://vurozagagi.weebly.com/uploads/1/3/4/6/134695821/tilopoxip.pdfIn PDF document text
    • https://jategolotigani.weebly.com/uploads/1/3/4/8/134882723/nagavujaral_lomitowelisam_lofulid_lozuzi.pdfIn PDF document text
    • https://bamegipizof.weebly.com/uploads/1/3/4/6/134647446/da4b6f.pdfIn PDF document text
    • https://tepidupelagoxu.weebly.com/uploads/1/3/4/4/134472529/migoneb.pdfIn PDF document text
    • http://rarokafu.22web.org/badiwuzumisekobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470681/normal_601da7767f426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_60247d90a06a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470679/normal_5ffe8ca2c7e80.pdfIn PDF document text
    • http://rumukisizupew.iblogger.org/sonobedezifurusumukafe.pdfIn PDF document text
    • http://fakaremun.iblogger.org/53765660486.pdfIn PDF document text
    • http://manoligixave.66ghz.com/clientline_reporting_first_data.pdfIn PDF document text
    • https://famalekirujapa.weebly.com/uploads/1/3/1/4/131453917/pefazuverakafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408711/normal_605a001ea6b69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455406/normal_604bca99444d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478687/normal_60637ff9bea69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuxedozet.epizy.com/punutopulogutekifu.pdfIn PDF document text
    • http://rawuvotatu.rf.gd/11022855660.pdfIn PDF document text
    • http://jorowubibe.epizy.com/baking_cookies_recipes.pdfIn PDF document text
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_fd5fbff1cdcd403ea325c10c2aee0bd0.pdf?index=trueIn PDF document text
    • http://gekobilewubu.rf.gd/video_discussion_platform.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_c893c1f13c09426aa5c2d6973b054381.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_off00011cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF8 4796 bytes
SHA-256: 22cab31adc4f1544866648da7e188904c8dd4aa8fe77d7e225ed3dd1360eb55f
font_01_sfnt_off00012d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D59 10912 bytes
SHA-256: 825ae80b2aa2cb78942cdbe43b144f655da111e6a64c327ba53d897f676ea0e7

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