Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f0cf2c80337d6e…

MALICIOUS

PDF

77.3 KB Created: 2020-11-10 06:49:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 39910bc4f69d28e3e5846b39040e7ac4 SHA-1: d83157bcb76b984e44d5df696c36d466901fd4ae SHA-256: e5f0cf2c80337d6ed15bdad8b29cea84bc066e6359eae3d65459e73fb0a8d3eb
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?keyword=clash+of+clans+update+2020+new+stuff PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454968/normal_5fa72ab66abac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f8d8b73bf06d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375080/normal_5f908a66900ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_5fa171089e2ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414164/normal_5f9a231a58da4.pdfIn PDF document text
    • https://ribafiligizeki.weebly.com/uploads/1/3/1/4/131438260/lofozan.pdfIn PDF document text
    • https://kikuvabafot.weebly.com/uploads/1/3/4/3/134332304/nanaj-xenel.pdfIn PDF document text
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/887ae8b4556f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f8d91d08aaf0.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/nuxulikiwab/34384760049.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/80879887532.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/melomoj.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/sofilajogek.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/the_amazing_spider_man_1_full_movie_online.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/14561154596.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_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 5368 bytes
SHA-256: f9af4439e91ace4ede1301fe52dbe2805b6a48d95ad440a838b9bbf626911154
font_01_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 10368 bytes
SHA-256: bbdd8f75ffbc5e5582858b04697876a73e1a0fe80cb7050851ae406e6687272d
font_02_sfnt_off0001198e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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