Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c85fc035445b523…

MALICIOUS

PDF

75.2 KB Created: 2021-03-01 08:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f57d7c7768e5560d023495f72b0cfeef SHA-1: 84a6231459ce706870a9ca8e64fa83af78735637 SHA-256: 8c85fc035445b52369ae4d2a62094cd48dc3ed284e14033001b992e9ee3009ef
274 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to redirector infrastructure and known phishing domains. The heuristics indicate a brand-impersonation credential phishing lure targeting Apple users, leveraging a redirector to a PDF file hosted on Weebly. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://goradexajegofip.weebly.com/uploads/1/3/0/8/130874122/zinenifenolomi_juvoravakovex.pdf.
  • 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://yafferge.ru/strik?utm_term=q+see+8+channel+4k+2tb+nvr In PDF document text
    • https://cdn.sqhk.co/tiwumixe/jThjig2/67173603247.pdfIn PDF document text
    • https://goradexajegofip.weebly.com/uploads/1/3/0/8/130874122/zinenifenolomi_juvoravakovex.pdfIn PDF document text
    • https://juvarefuj.weebly.com/uploads/1/3/1/3/131398009/poxupemufiradozifu.pdfIn PDF document text
    • https://cdn.sqhk.co/gobumavurob/Dgggchj/nujofetovexo.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/wadijobinetezuwi.pdfIn PDF document text
    • https://libotavod.weebly.com/uploads/1/3/0/8/130813055/497a835d783e21.pdfIn PDF document text
    • https://zigulowowe.weebly.com/uploads/1/3/1/3/131380415/rurum.pdfIn PDF document text
    • https://fobaripiso.weebly.com/uploads/1/3/4/4/134443650/gasigexoxonet.pdfIn PDF document text
    • https://gunefadube.weebly.com/uploads/1/3/5/3/135388078/4990907e9f59129.pdfIn PDF document text
    • https://fazolusafiwef.weebly.com/uploads/1/3/4/5/134585025/087a1e501de7dab.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/igjcy6Z/746148905.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/ginutu/fagivekuwesavepujodubi.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/ac_20-_130a.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/how_do_you_change_a_thermal_fuse_on_a_maytag_bravos_dryer.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/general_sani_abacha_speech.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/anubhavinchu_raja_show_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/interview_questions_for_teaching_positions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/vubanogewunuzowegilan.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/tasefif.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_off0000e633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 5628 bytes
SHA-256: dbab08be7eb599aef6d2d64c0224f293f47b419eb52530e4f03593c16dad7983
font_01_sfnt_off0000f95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 11132 bytes
SHA-256: e6c4294cbada459efc97605278c84a3d368443f0c16f0f54f888ff18aa09d378

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