Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c0883326566a20…

MALICIOUS

PDF

69.3 KB Created: 2020-11-25 05:50:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57389ba30ebfc6014175005b039586a9 SHA-1: bb44e9d5eaa645b1077f3c5154bd554340e6ef4f SHA-256: 15c0883326566a20adc1bf819870e9bde9d14b000cf7acb78a24bd0bb77fa1e4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in phishing or to distribute malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and one specific URL is extracted. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/123?utm_term=free+nursing+care+plan+template+word
    • https://cdn-cms.f-static.net/uploads/4385230/normal_5fa1be82ed2ae.pdf
    • https://cdn-cms.f-static.net/uploads/4384468/normal_5f98b0a4b3a5d.pdf
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/gosibokuvefuj.pdf
    • https://cdn-cms.f-static.net/uploads/4386606/normal_5fb26182abc75.pdf
    • https://cdn-cms.f-static.net/uploads/4389603/normal_5f95f0bbd721b.pdf
    • https://cdn-cms.f-static.net/uploads/4393499/normal_5fa7d3b24eb65.pdf
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/xileteb-filimomixogolag-goguvigadixi.pdf
    • https://cdn-cms.f-static.net/uploads/4387709/normal_5f93bb99b5c36.pdf
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5fb39eafce3c4.pdf
    • https://cdn-cms.f-static.net/uploads/4382193/normal_5f8db385f2b08.pdf
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f87611816685.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/95832c44-798e-4307-8681-1144e748c1bb/58944348919.pdf
    • https://s3.amazonaws.com/wumodukubaru/luferovufawusabasew.pdf
    • https://s3.amazonaws.com/pazifetanegapu/22837563313.pdf
    • https://uploads.strikinglycdn.com/files/d1165b6d-2e55-43e8-999e-ea291600706c/msi_laptop_wont_turn_on.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1e9.bin
dbcdf12f20348c2435253ac46801603008a13d2937d20b2dbe15c3ce16db5ef5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E9 5440 bytes
font_01_sfnt_off0000e469.bin
507c179b30c2bc1a022e27298d99a13fb2e45ae0075fabc6701ec547e3bbf3bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 10596 bytes