Malicious PDF — malware analysis report

Static analysis result for SHA-256 d539341c3bbdfe77…

MALICIOUS

PDF

77.8 KB Created: 2021-02-20 07:03:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9a8df5190adbc1bd509be3ad3f5f3917 SHA-1: 0fb4702c217e166c1a9887db84e206069deb12cb SHA-256: d539341c3bbdfe77c54b128ddacb1d47b4795e56e1b8d4bfae31faf1744f1ca4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were extracted, the presence of numerous external URIs and the overall structure strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=south+beach+diet+meal+delivery+reviews PDF link annotation
    • http://vehicleusains.com/2004_chevy_malibu_for_sale_craigslistfuvun.pdfIn PDF document text
    • http://wekeb.space/145774618286lrh8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416495/normal_600355124fb54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410190/normal_5fce563e26cb2.pdfIn PDF document text
    • http://effektzhizni.ru/ropotililedolumufjuba6.pdfIn PDF document text
    • https://gidelusibi.weebly.com/uploads/1/3/4/0/134040719/8624915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381756/normal_6022827704951.pdfIn PDF document text
    • http://loveantravel.xyz/55447409566cfyyd.pdfIn PDF document text
    • https://golotarati.weebly.com/uploads/1/3/1/8/131856611/d366e4698.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/602716.pdfIn PDF document text
    • http://bigpleasure.ru/fabasomazuwinubiremazmcjs.pdfIn PDF document text
    • http://vorgazme.com/2868993988099y8e.pdfIn PDF document text
    • http://nadahul.ru/identifying_shapes_worksheets_1st_gradenjdlj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_5fd30a7069974.pdfIn PDF document text
    • http://hesap-al-sat.com/bevesixamefikoj86usc.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_off0000ee0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0D 5676 bytes
SHA-256: fe30290538f8df7e8caf8b46145278300b1c2ec71ec118f1fc0d6b783bfc9793
font_01_sfnt_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 12228 bytes
SHA-256: 1a0e637e6342fcbcbace8bb6539fd23b60c24c09619bd5d94786c99a09373110

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