Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec986da93e20cb3a…

MALICIOUS

PDF

83.4 KB Created: 2021-03-02 02:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6c55c8d5f94cb3da24c8b8dfcf273552 SHA-1: 18e851a53feb7f76cbd9ccd3fadcf0d0d21a6ede SHA-256: ec986da93e20cb3a45fea3c4ddee24c08458cd54bc442d87a102e3508e48b74c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic and multiple unknown reputation URLs reinforces the assessment that this document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=anthem+vocabulary+chapter+1+worksheet PDF link annotation
    • http://bazis-rostov.com/tutawaloguxaverojotokine2m.pdfIn PDF document text
    • http://fragcups.com/64289008993prv0c.pdfIn PDF document text
    • http://hocostyle.ru/lejaluxans856b.pdfIn PDF document text
    • http://digtalcaliper09.xyz/47903612397yrxh6.pdfIn PDF document text
    • http://gatatezeguwevo.iblogger.org/how_fast_will_a_50cc_scooter_go.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/70551166598.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/why_is_my_aux_cord_not_working_iphone_7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejesezape.myartsonline.com/2011_ford_escape_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/29130223168.pdfIn PDF document text
    • http://wosipofu.rf.gd/is_the_green_scapular_approved_by_the_catholic_church.pdfIn PDF document text
    • http://wuboxobotuz.rf.gd/durawegupunajet.pdfIn PDF document text
    • http://jejesufunaderuv.rf.gd/sudden_cardiac_death_guidelines_2015.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/uscg_aeromedical_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 5672 bytes
SHA-256: 48a83e3c170892bdac47a02ea0d0c6dceba33fb0c141b6a140d9c98274ab9aad
font_01_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 10560 bytes
SHA-256: 35191d07e79c8c968fe36382aabce9d18d838b15c14446b044c46eb0d5729df0
font_02_sfnt_off00012aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEE 16184 bytes
SHA-256: 123975e40135809d541a909889c89f4c2c1f20fdb68e7364e169f08795e4f36c

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