Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3873c63e578353…

MALICIOUS

PDF

50.6 KB Created: 2021-01-08 08:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6be6e8282190019247bbc6db3863bb46 SHA-1: b1ea93120dda3d9f10ec7cc6822e8331b22fdabf SHA-256: 6f3873c63e578353de9c42c1150bc6750d0df8cf91193bf21b38f9844e1efbba
182 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links that are identified as malicious redirectors. The document body, though heavily obfuscated, suggests a lure related to educational materials ('free english worksheet'). The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9725

Heuristics 4

  • 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 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.
  • 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://gettraff.ru/aws?utm_term=free+english+worksheet+for+lkg In PDF document text
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/7565564.pdfIn PDF document text
    • https://dewajijivixire.weebly.com/uploads/1/3/4/6/134638152/9901414.pdfIn PDF document text
    • https://nunezexivu.weebly.com/uploads/1/3/4/4/134440215/8d39e199241d74e.pdfIn PDF document text
    • https://tivurenufetoza.weebly.com/uploads/1/3/4/2/134235987/63dba7.pdfIn PDF document text
    • https://sakafafemowuva.weebly.com/uploads/1/3/4/6/134694971/8528605.pdfIn PDF document text
    • https://xiforamuti.weebly.com/uploads/1/3/4/6/134611992/8219028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a3103b-dc07-47fe-a013-db942d0eb69a/80318081277.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/bonojetajadesadulirin.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/rch_clinical_guidelines_inguinal_hernia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbad336f-e968-4dff-a2bd-2870f8b28978/87003052463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/282be27d-89c1-4c47-ac4e-929c0e573eb2/jejezetojazosulujopir.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/76413616882.pdfIn PDF document text

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