Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c4db8340b361ef…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 10:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3378fe721cf97829488f513241736ac SHA-1: fe2a4c99e23cf67d64335130f10c39ae9f2eb948 SHA-256: a1c4db8340b361ef1c3995a7962708a04cb5a181c3c61c444d0f2873fe214924
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on various domains. The presence of multiple external URIs and the 'link farm' heuristic suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vmwarts.com/ecovic/file/44465667821.pdf
    • https://tessuno.com/upload/files/614483d55de3b.pdf
    • https://tims.ro/ckfinder/userfiles/files/43936032898.pdf
    • https://mfdesign.hu/files/file/wuxomifovezimon.pdf
    • http://crystaltrade.hu/data/file/3687519599.pdf
    • http://another-partner.morefriendship.com/upload/files/82985469746.pdf
    • https://invest.pl/userfiles/file/37254730925.pdf
    • http://husplaza.hu/editor_up/dukidibawi.pdf
    • http://kaymccarthy.com/immagini/file/jivekikijalojalelimituse.pdf
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/lodedolapelibepisukerosaz.pdf
    • http://amsasecretariat.fr/userfiles/file/2217139068.pdf
    • http://merlegdoktor.hu/tmp/85799832430.pdf
    • http://ville-dammarie.com/ckfinder/userfiles/files/9198435335.pdf
    • http://fpole.ru/sadm_files/83525983940.pdf
    • https://hkbca.org/UploadFiles/file/20210915175809160.pdf
    • https://zegaoyun.com/calisma2/files/uploads/80333210333.pdf
    • http://www.urbanwaterways.info/files/xeguvagod.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45785165542.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/49099529824.pdf
    • http://dorp.pl/userfiles/files/gonowibutoxomadit.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142578af3181---dadijaresavi.pdf
    • http://jljemc.com/upload/files/64698271847.pdf
    • https://nhabe.com.vn/ckfinder/userfiles/files/69881603174.pdf
    • http://remobudostol.pl/pliki/jogogujonevebevorixus.pdf
    • http://camonetinternational.com/files/file/47924521128.pdf
    • http://ebus.cn/up_file/file/21585797323.pdf
    • http://worldcar.jp/userfiles/files/paxiguwobesaj.pdf
    • https://digireg.cn/upload/seduximeta.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=campbell+biology+pdf+download+free
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE23 16792 bytes
font_01_sfnt_off0000e63a.bin
02a7d951619879ed9284ebab7f558a9c2e10da7feb12979aa2c6ef26e1a59360		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 10948 bytes
font_02_sfnt_off0000ff21.bin
9269f19ed2b95d001ff924379780f6e8da9b0fb0bf555cbd301dd3c7484af820		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 17024 bytes

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