Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb19adcdfee3fb5…

MALICIOUS

PDF

65.5 KB Created: 2020-12-18 15:24:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ec55c76169d5bdc78de4e1bd0fd36d1e SHA-1: 7f320cb08f48cefae9a44c292af4347a79cf3372 SHA-256: 5eb19adcdfee3fb5629d6be87a880d5a83c5ae6740f9a6350c526ebbd40be6cf
214 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The primary malicious URL identified is https://cctraff.ru/aws?utm_term=a+grande+muralha+da+china+kafka+pdf, which is likely used to redirect the user to a phishing page or download further malware. The presence of numerous external PDF links suggests a tactic to evade detection or distribute content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://cctraff.ru/aws?utm_term=a+grande+muralha+da+china+kafka+pdf In PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/9259492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_5fc0963a16a46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5fa620c3c16b6.pdfIn PDF document text
    • https://lunipudazu.weebly.com/uploads/1/3/4/4/134462877/743517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472773/normal_5fafaf11c203a.pdfIn PDF document text
    • https://reropazorulofo.weebly.com/uploads/1/3/4/4/134437501/dizavixikejoriresadi.pdfIn PDF document text
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/wamivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/31570485929.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/practical_design_of_sheet_pile_bulkheads.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/30173038520.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/pevozuninilufumaf.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1fc7e6d49a06bb5a2eb3/1606295497352/75965383494.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D4 5136 bytes
SHA-256: 22cf1564230898782c9a98066bb51ced5e13e17c1386975d475bd05334a284e2
font_01_sfnt_off0000c912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC912 9900 bytes
SHA-256: bba16909612d8e6baeb8c65bb255a08b026dadc4313c43aa2e14b4a5fe237ccc
font_02_sfnt_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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