Malicious PDF — malware analysis report

Static analysis result for SHA-256 209bce0743c60a39…

MALICIOUS

PDF

67.9 KB Created: 2020-12-14 19:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 36ef21317f5f5c0a1bdfa42972100b0e SHA-1: 261f1121b3773d123c6f91faf98b84a730143538 SHA-256: 209bce0743c60a39f63d02e0996adda2c80d9537a026323c1c6c39ae3acdbf46
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded links that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The document's content, though partially corrupted, suggests a lure related to educational material, likely to trick users into visiting the malicious URL for a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://cctraff.ru/aws?utm_term=decimal+to+fraction+worksheet+grade+7 In PDF document text
    • https://boxavaruju.weebly.com/uploads/1/3/4/7/134759985/5897418.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/jozij-lafanivaxe-gitup.pdfIn PDF document text
    • https://mukeluxera.weebly.com/uploads/1/3/4/5/134528716/mopij_gilabakukizurab_jejab_xinavogu.pdfIn PDF document text
    • https://femodufawo.weebly.com/uploads/1/3/4/3/134317846/parunulolu-buzazazereza-petivomulo.pdfIn PDF document text
    • https://rulomegujenuguv.weebly.com/uploads/1/3/4/3/134329868/jepagitit.pdfIn PDF document text
    • https://wubixuduliku.weebly.com/uploads/1/3/4/4/134466255/b6db014.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/03c6f5f195.pdfIn PDF document text
    • https://ribobuwatefinu.weebly.com/uploads/1/3/4/4/134469587/2303848.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/5fbce344be7cfc36344e8aaf/t/5fbcfa6464a3cc4058a46ef7/1606220388586/modern_combat_3_1.1.7g_apk_data_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce7770f8fded1eb1b373cc/t/5fd6afed3ebe0416316c380b/1607905262570/gogopumibaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f4ec871-bd81-4384-8424-4dcf530de000/david_childers_fl.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/sugezewijewuzosujugel.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_off0000c99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 5668 bytes
SHA-256: af56af32caee16018f19f23d45d179694d47b488e894098f58e09a430574e497
font_01_sfnt_off0000dcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD5 11044 bytes
SHA-256: 54b2803350553b79e7baad8d465503907b0681982fbb03222cbb32078cdd857d

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