Malicious PDF — malware analysis report

Static analysis result for SHA-256 482cf12bc42c5342…

MALICIOUS

PDF

114.2 KB Created: 2021-01-08 11:09:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a295d430e20093b8b231a16e320d909e SHA-1: d24f1c8df847ea1e1580f5f74d1691a19be0eda8 SHA-256: 482cf12bc42c5342824172f6e04d217c9addcdd23bc45c9bfc251a630d1d24b7
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to create a link farm for SEO manipulation or to host phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffine.ru/aws?utm_term=newborn+jaundice+guidelines In PDF document text
    • https://cdn.sqhk.co/vamunidibu/V3HMfSd/uber_driver_appointment_leeds.pdfIn PDF document text
    • https://sifoginugiji.weebly.com/uploads/1/3/4/5/134588619/piropukapigawosiva.pdfIn PDF document text
    • https://cdn.sqhk.co/wavefekus/jbBySIS/17123806529.pdfIn PDF document text
    • https://daxulidotuviwo.weebly.com/uploads/1/3/4/5/134597057/2941541.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/jfUcha4/f_stop_media_gallery_pro_apk_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f93a66-4490-4bbb-9f23-a884e4057303/84959203832.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/girlington_primary_school_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/indesign_e-_magazine_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/according_to_the_poem_harlem_by_langston_hughes_what_happens_to_a_dream_deferred.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1d94a34-9c67-49b4-9a30-a416905c9220/ledoletepujofotudipufiz.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/14784646322.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/rexugepazobuga.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/free_jigsaw_puzzle_powerpoint_template.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_off00018011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18011 5384 bytes
SHA-256: c6d69f8f81e5e974a7da1123eaefd4ec5bfacf5db90201bfc4e50356f21b12e2
font_01_sfnt_off00019285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19285 12476 bytes
SHA-256: aea95d1c4ef74f6fe32bd7e16304dd506b87fe778df4cb40c6317df5bd4145e5

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