Malicious PDF — malware analysis report

Static analysis result for SHA-256 efeb95dc9834bae4…

MALICIOUS

PDF

69.7 KB Created: 2020-11-17 01:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6bdd4d9b241286b0b9c569cdc5c7552b SHA-1: 2f02a0b2a00340a8c56149a90309501708cc70d1 SHA-256: efeb95dc9834bae4cb4ecd6411ed37126f781dbf32918eedfa1de45b87b24c2d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffking.ru/strik?utm_term=valoracion+primaria+y+secundaria PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494674/normal_5fabaedea165e.pdfIn PDF document text
    • https://foposivore.weebly.com/uploads/1/3/4/4/134472686/5102354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_5f89c37f8d0c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_5f93e3433f909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473642/normal_5fa9c1a129103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_5f9b93af74769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5f98972477f19.pdfIn PDF document text
    • https://fugiweritukasuj.weebly.com/uploads/1/3/4/6/134682589/c1b4cbb3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_5fa2ea1a7fb7e.pdfIn PDF document text
    • https://dokipodaj.weebly.com/uploads/1/3/4/3/134306773/dilade_fowebimuxozepul_losotekigoxadob.pdfIn PDF document text
    • https://rizowexerezo.weebly.com/uploads/1/3/4/2/134265486/6539056.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/tofibapifumefunuwaju.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://uploads.strikinglycdn.com/files/afc2302c-9a3c-4aab-b081-07b755e50de5/vuribebasapikuselizexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04b7ead-56f3-42fb-9858-c213141e9e9f/strucid_aimbot_for_free_injectors.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_off0000c6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C2 5088 bytes
SHA-256: c1cbbb743888d1a5a1cdf639ee00fb8d2ee3e401db2263a0139c5c3a7162e11d
font_01_sfnt_off0000d7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 11140 bytes
SHA-256: 38e0775ac1bdeee94e8863a51a4995b8fc64cbfe48499569e601e7aed9f9be1e
font_02_sfnt_off0000fbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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