Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3a44545949ca88…

MALICIOUS

PDF

75.5 KB Created: 2021-01-01 22:32:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f90dcd7a2cb80140b1aa5ff616568927 SHA-1: ef1ade0392469a36ac125dd4793181f45facd7d3 SHA-256: 3b3a44545949ca88ff87adcfa2cf8b7fa9ce214725d124459ecc29aaf4ef3e4f
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links pointing to external PDF files, many hosted on disposable domains or known redirector infrastructure. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

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/strik?utm_term=hearts+on+fire+rocky+4 In PDF document text
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/zurogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393502/normal_5f8fa2679d52e.pdfIn PDF document text
    • https://rupasofo.weebly.com/uploads/1/3/4/8/134892789/734031.pdfIn PDF document text
    • https://xosovixa.weebly.com/uploads/1/3/4/3/134318585/fifujabawusefew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470540/normal_5fad68a7c7373.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458122/normal_5fcbb4a0a9b8f.pdfIn PDF document text
    • https://tuwunofibe.weebly.com/uploads/1/3/4/6/134657164/kibex_gatebuvur_nakaremogose_zazofuvuzalad.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/wobifixujikenededufo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495694/normal_5fee8a879e351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_5fd60daf35d72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393356/normal_5fb86a0e67b22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/emulator_android_untuk_pc_ringan_ram_2gb.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_off0000d445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD445 5060 bytes
SHA-256: 0025c3f9dc7903692c750cc7a6c75eb703eedf52f5cb983d031ac9714a041ec6
font_01_sfnt_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 10148 bytes
SHA-256: 5919a8dfacc6c67504780108e854c2822b90f1301e936f33e5e019f8bf4264f8
font_02_sfnt_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 16572 bytes
SHA-256: 28da33ee266232bee255880df1e6df4ebadfd84973d0e1ebdedc76e4e75a96c4

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