Malicious PDF — malware analysis report

Static analysis result for SHA-256 514864bf5abbe7c1…

MALICIOUS

PDF

96.8 KB Created: 2021-06-01 02:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 253579cf6aefb3e64e0b7e7e232244f9 SHA-1: e622b6e914144fb654d9fc8238d8f2ee3598304d SHA-256: 514864bf5abbe7c12018c9511c7cc3b96c80ff564a0105abc9347c69e6bd2349
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting it's designed to drive traffic to other sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically as a phishing or trojan distribution mechanism. While no scripts were directly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

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://huntic.ru/pbw?utm_term=charles+dickens+novels+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4419195/normal_5fd7d702bcbae.pdf
    • https://subuletow.weebly.com/uploads/1/3/4/2/134265429/851660.pdf
    • https://bavipemafenun.weebly.com/uploads/1/3/1/3/131398101/916a2952e6.pdf
    • https://lonerunit.weebly.com/uploads/1/3/4/0/134017922/3969778.pdf
    • https://kadekorik.weebly.com/uploads/1/3/1/4/131453454/binumogokaw-xegot.pdf
    • https://pixofefen.weebly.com/uploads/1/3/7/5/137503885/8187050.pdf
    • https://wujuzuvetawi.weebly.com/uploads/1/3/1/3/131379059/1440456.pdf
    • https://gidiwukos.weebly.com/uploads/1/3/1/3/131381706/6317475.pdf
    • https://cdn-cms.f-static.net/uploads/4485930/normal_5fd7a0fbcdd9b.pdf
    • https://rawoxoduzipuk.weebly.com/uploads/1/3/2/3/132302868/a365c5949e3f6b.pdf
    • https://static.s123-cdn-static.com/uploads/4476946/normal_5fc75b0a4aad5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pezeliv.pbworks.com/w/file/fetch/144426207/obeb_okek_soru_zm.pdf
    • https://uploads.strikinglycdn.com/files/1ce4f5ca-ad34-4c7a-815d-d55070a8a256/59909182301.pdf
    • http://visetululiv.pbworks.com/f/how_to_pass_rn_nclex_2020.pdf
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144417609/vuxetisuvivimasoxepe.pdf
    • http://supatibu.pbworks.com/f/naleler.pdf
    • https://uploads.strikinglycdn.com/files/32a103a9-93df-426e-b885-192c00c559d2/dean_koontz_movies_streaming.pdf
    • http://nusuwoxub.pbworks.com/f/penny_stocks_to_buy_robinhood_reddit.pdf
    • http://jesababa.pbworks.com/w/file/fetch/144413535/velogogobovopulogoxabori.pdf
    • https://uploads.strikinglycdn.com/files/97677f1f-f17f-4a59-9059-5a0979c8e204/jandy_aquapure_ei_series_salt_generator_manual.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_off00013691.bin
b4b6d680dbea90a6a4b90d171c56d79364b7aa9dcfd6b5d6ac2d0efd925bbc8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13691 5364 bytes
font_01_sfnt_off000148dc.bin
8eb198a028103c0a1507093a73dd10d2e2ae1401661464ece0c59fbf67d7815f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148DC 14676 bytes

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