Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88c85a62069fd19…

MALICIOUS

PDF

103.6 KB Created: 2020-12-09 10:06:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a238cd1fa03dd3473a3b0b69675eaafa SHA-1: 1721ec1b14991883aa68ae169be1f2f283fdf60a SHA-256: a88c85a62069fd19ef3597d34f08ddce0a60a9fa602eacd4f4c5e8b81f017b64
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

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://traffking.ru/strik?utm_term=tat2+task+3+instructor%2527s+manual
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/8264043.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/toliwudalamem/commercial_property_inspection_report_template.pdf
    • https://s3.amazonaws.com/belapawerezuju/craiglist.org_raleigh_nc.pdf
    • https://s3.amazonaws.com/leguvefu/17110045398.pdf
    • https://uploads.strikinglycdn.com/files/3d46ba99-e446-429b-b258-26fbbf1a20b1/zutamitazefazewisalokoxoj.pdf
    • https://uploads.strikinglycdn.com/files/ffe45f8b-0d19-4315-8d20-45caca180b21/25148884091.pdf
    • https://s3.amazonaws.com/lomuper/31483576493.pdf
    • https://static1.squarespace.com/static/5fc53afda3bf4b14abc57bb9/t/5fcb411966ddd570b0f2653c/1607156000785/56364813995.pdf
    • https://static1.squarespace.com/static/5fc0bc4127a199023ab47ae9/t/5fc13ae84e98326c023d2b3b/1606499049044/zekukeraganodixi.pdf
    • https://static1.squarespace.com/static/5fc77e789ea50d4120a1e88b/t/5fcd5bef8a55f2188b8946a9/1607293936038/flip_the_gun_mod_apk_unlimited_ammo.pdf
    • https://s3.amazonaws.com/sesijesule/dipupulunavip.pdf
    • https://uploads.strikinglycdn.com/files/90b594cd-6f6d-4556-bc7d-7d03aec22817/wexoxopur.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf68eb4c4d833b8bd03b5/1606219410998/80730609355.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_off00015a39.bin
35f17c20e335c23f2368f4e075f66110ec1950e8e7e90d29e517b108805bce3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A39 5288 bytes
font_01_sfnt_off00016c29.bin
d1c0f04934ff9d3532889e50919384762da52cbb13c134a679f90268fc8a6831
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C29 11196 bytes