Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04976719b3e9a51…

MALICIOUS

PDF

76.9 KB Created: 2021-09-12 13:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 231da487a34e00292248b7cb3f9bfb6c SHA-1: 195efb617fa22c33d79a654258ee0fec9fd4b49b SHA-256: a04976719b3e9a51096682dcf28cb18a2842c2e00b2513651f75d87b7b1e4b22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/nasabesesi.pdf In PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/popoxavafag.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-2/20210902142831688053.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/vimenotevidopav.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/xizilapiwurugaxaxi.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/64962406694.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/73766902190.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/pozufus.pdfIn PDF document text
    • https://csodamalom.hu/files/files/41318848265.pdfIn PDF document text
    • https://atiksigorta.com/files/49031663569.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/88620955049.pdfIn PDF document text
    • http://uteambio.com/upload/files/jufuwoluda.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/xewudupinaxaku.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/vutofiredefinagako.pdfIn PDF document text
    • http://africareview.in/userfiles/file/zadalebovumugewapuvavapo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/68243389688.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/rufamelanoxi.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/21294430263.pdfIn PDF document text
    • https://uudanbury.life/files/file/temebuvu.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/muxevugazisofo.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/bopiboluz.pdfIn PDF document text
    • https://x-software.cz/data/file/65346937408.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/492e09c7edeb02657ff512c6afed4faf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=where+can+i+find+mock+location+settingsPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10C 16972 bytes
SHA-256: addb4c9f0a346a3e428ad47b060c8f15e68591858656e788523a9bed0006d669
font_02_sfnt_off00010d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0D 11008 bytes
SHA-256: 7d9a18cd7f4ca974dbd1721c042b2629aeacf83c87ce07e1b4fa561a7b219789

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