Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d05bdae5e9a376…

MALICIOUS

PDF

67.5 KB Created: 2020-11-20 13:51:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 077a703c7ffc7fabe310ee5c41fa42dc SHA-1: 66fb3a92263c5345a02e3436c9ca89ac39ca835b SHA-256: e3d05bdae5e9a37687bc90acbe624e2d8d713ed71564eb1a3c447273752c24b6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign content, but one suspicious URL (traffset.ru) is present. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=roll+and+write+games+2019
    • https://gisetokitalakak.weebly.com/uploads/1/3/4/6/134600310/nizadokixit.pdf
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/085e8efba9fb565.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zirojopemup/xiradox.pdf
    • https://s3.amazonaws.com/tesasubawalozan/vodafone_speed_check.pdf
    • https://uploads.strikinglycdn.com/files/5b98e8af-0ac8-4e49-bf95-67700eb81132/17470204701.pdf
    • https://uploads.strikinglycdn.com/files/9ab5dd83-6839-4de8-a776-2be62e7182bc/65884618651.pdf
    • https://uploads.strikinglycdn.com/files/0e885bdc-76ed-4420-a64d-29413effa8bb/gesapuropusagofu.pdf
    • https://uploads.strikinglycdn.com/files/31a291e5-2c4f-4bca-b42d-48378c43e685/59182460546.pdf
    • https://s3.amazonaws.com/juxatop/sebixerejutaj.pdf
    • https://uploads.strikinglycdn.com/files/2ec08d5b-c7ce-459c-92ac-ce1aae4f1978/62306961164.pdf
    • https://uploads.strikinglycdn.com/files/1a3630f2-7b56-4d90-8fe4-b664804211a2/83130789470.pdf
    • https://uploads.strikinglycdn.com/files/4c5752a4-3ea6-4a77-8935-07f2e3f77fa9/7044562389.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_off0000cb45.bin
5475025dc0f8bfdb2ffcbb1b34ac00bfab156f702cc917dbd85f4a30e65282b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB45 5728 bytes
font_01_sfnt_off0000dec3.bin
cb15d37d507bfe33cacc4b5019bc37a94d044af08c94e429c3fbf2f59ab6edde
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 10436 bytes