Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb06da27c03a02d6…

MALICIOUS

PDF

73.8 KB Created: 2021-01-08 13:55:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6308048082acff053eaf216b06967b6c SHA-1: 9b7f1b7d781c01671803a9643983121d213ad014 SHA-256: bb06da27c03a02d65ba1392cfe6ff8762aa901a57cfa0f9680d774838994a321
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains and point to known malicious redirectors. The document body, though heavily obfuscated, suggests a lure related to educational material ('Demonstrative pronoun worksheet grade 4'). The presence of numerous links and the detection by ClamAV as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://gettraff.ru/aws?utm_term=demonstrative+pronoun+worksheet+grade+4 In PDF document text
    • https://buvitefano.weebly.com/uploads/1/3/4/1/134131500/dirakozawoxab.pdfIn PDF document text
    • https://bazigumaxofiz.weebly.com/uploads/1/3/5/3/135383162/deac9ad2e848e.pdfIn PDF document text
    • https://petarukezatu.weebly.com/uploads/1/3/3/9/133997491/2712312.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/gcAn0rp/padoxidufopimubomo.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/6602457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481510/normal_5fdbad8acbd49.pdfIn PDF document text
    • https://newekozowoni.weebly.com/uploads/1/3/0/7/130738578/buxebadisuki.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/2068daf0-be6b-4d7a-af73-6dbb3318a851/tiwavabiwixexubobigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/993dbd71-6b08-4ef9-ad46-000f655d11ea/14521437563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85decdf5-b517-4480-9246-c7d24684a0d1/26047724464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2afca3ef-b2c8-4588-8261-185be7130db9/sumifegavefenerezojuvinap.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBB 5644 bytes
SHA-256: c613cfc8f3abc0a2f008c52f65d087e089b35d2abeed16015ea51a39f1968a5b
font_01_sfnt_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 10608 bytes
SHA-256: 75f801177678c2e43e4d50f706a7851c8f5a7d394c5600718d0c38b0890d86d2
font_02_sfnt_off0001040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 16060 bytes
SHA-256: 5b45d8957cdd618c0f157c507058aef1810e6158bb3d1abf257796d6008f54d1

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