Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bef41ff39012bc2…

MALICIOUS

PDF

76.3 KB Created: 2021-01-12 07:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9026a9c86d424210e52668f65ae9ade2 SHA-1: b8907e2c9dee7d170f045d4d8ac14753bdeffd61 SHA-256: 3bef41ff39012bc23f75b360c4b197cc599f4feb1b79263ae8362d31faec9845
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to disposable domains or are used in a link farm configuration. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted from this sample, but the structure and URL distribution strongly indicate a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=inflatable+unicorn+sprinkler+aldi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455207/normal_5fa28980f2ec4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385862/normal_5fa91bb50e3d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459780/normal_5ffd1533493c6.pdfIn PDF document text
    • https://site-1224335.mozfiles.com/files/1224335/wedureboruvawuloxusu.pdfIn PDF document text
    • https://site-1226757.mozfiles.com/files/1226757/score_hero_apk_indir.pdfIn PDF document text
    • https://site-1166749.mozfiles.com/files/1166749/fatidonosebo.pdfIn PDF document text
    • https://site-1168306.mozfiles.com/files/1168306/25134572129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472763/normal_5fd3a81d20594.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/varowo_dibebuwifuxaxe_dunesonozeba.pdfIn PDF document text
    • https://site-1171785.mozfiles.com/files/1171785/jamaican_style_dominoes.pdfIn PDF document text
    • https://vugosolisaxude.weebly.com/uploads/1/3/2/8/132814967/bepaneto_buborizuporite_wepaju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380383/normal_5fae112a26188.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499673/normal_5ff91fe98c53c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 5292 bytes
SHA-256: 69adf1199e32df3f247fa62c79fdbb2d99c7f17ff0be2cf6f8c08551aaa2b52e
font_01_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 10740 bytes
SHA-256: 960e61f24046a1963856badadeb9ce81962a9b0f0ff6c8e9a14037d8207141e9

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