Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d87cb3c248833d…

MALICIOUS

PDF

71.0 KB Created: 2020-12-18 09:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7eb3c65ad897c3526ca5fcf203e94556 SHA-1: ed633d05567604bbd4165418a2f24128a90240ae SHA-256: 72d87cb3c248833d2ec89085009b560362ff12b25a1b496cf28f941bd0af3375
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'medical terminology lab answers'. The presence of numerous external PDF links indicates a link farm designed to distribute malicious content or phish users. The primary malicious IOC is the redirector URL.

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://traffmen.ru/strik?utm_term=my+medical+terminology+lab+answers In PDF document text
    • https://kakoxisowi.weebly.com/uploads/1/3/4/3/134358665/wujamozazana.pdfIn PDF document text
    • https://diziwupufetut.weebly.com/uploads/1/3/4/4/134477772/pudali_bavaro_risuxufusibagiw_vijoruwusefin.pdfIn PDF document text
    • https://pirivelel.weebly.com/uploads/1/3/4/5/134505874/vatexozibajibo_wejijan.pdfIn PDF document text
    • https://zapaviboxoxag.weebly.com/uploads/1/3/3/9/133997465/lafunova.pdfIn PDF document text
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/9415006.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0f05df9866f3fd2d48fd4/t/5fc131dde18c5c478e272f79/1606496734635/56542030414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6bef0d2-2237-434a-ac1f-890ec4215777/39754806947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55735c2e-503e-4b01-8e3d-6be490aa69a6/wufaresosixogono.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc65a04ab79f442f24ead5b/t/5fcc9fd2920f47545b8eec1c/1607245779520/20308168029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c63263c3-0141-49fc-be3a-54d83a22abe7/how_to_counter_jungle.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce3634ecb86110b136d536/t/5fd1552f02d970030bc5f9dc/1607554353066/6087976775.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2be63405d5340f3359679/t/5fcc297fd336b863f0b30b36/1607215488169/boluzisodumafaz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51ce4d26ff1194f8f2d2c/t/5fcdff88c836a917f93243a3/1607335821149/phage_therapy_center_usa.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_off0000da92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA92 5596 bytes
SHA-256: 88d8cd1f2a1b36c9d0888e69d3e45fee074f929a3f5331d055af7d724224e9a6
font_01_sfnt_off0000eda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA0 9832 bytes
SHA-256: 8e9a6dc2509a0301b055b96c50db6193099a186c0d0920f9a165eb7474d7a0c8

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