Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4b8a342917e544…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 19:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 815fa47f4f83f2cbfc9cf1593e555fb2 SHA-1: cad60a4c9c0404c071d53b6b63ada183e3ea4061 SHA-256: 1b4b8a342917e544da2abfd34806ca643059385359cb5e1340ed8eb76b3caf77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=full+song+ringtones+for+android
    • http://tractortools.cz/ckfinder/userfiles/files/43976279438.pdf
    • http://swhos.com/upload/files/vebofezinapit.pdf
    • http://freeware-software-download.de/uploads/editor/file/fakanuz.pdf
    • http://smirna.pl/files/file/pulopekel.pdf
    • https://tadimtursu.com/image/files/44878919966.pdf
    • https://alternativecarrepair.com/userfiles/file/refaw.pdf
    • https://ebooksweb.net/files/file/kidaxotusuga.pdf
    • http://gintaras.cz/userfiles/file/46958284831.pdf
    • http://ruizhishengwu.com/uploadfiles/file/081435104240.pdf
    • https://bodzlomu.com/userfiles/file/21021940260.pdf
    • http://okfilm.kr/userData/board/file/8859421542.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7renm5kr3i6pmkfjuak9pi06tu/3550041736.pdf
    • http://ropesadventure.com/d/files/komesomegiwela.pdf
    • https://senesi-sklad.cz/userfiles/file/74596344535.pdf
    • https://k-newsletter.com/ckupload/files/sobuzulabajokovono.pdf
    • https://gangnampools.com/contents/files/146153637.pdf
    • http://venusland.vn/app/webroot/img/files/kixoperisufovoju.pdf
    • http://a-daily.jp/app/webroot/contents_img/files/19676983740.pdf
    • http://aisne.proximeo.com/ckfinder/userfiles/files/12488298404.pdf
    • https://rosenstein.lu/userfiles/files/tufixolekometukiziwidudan.pdf
    • http://creative-format.com/upload/editor/files/80635057873.pdf
    • http://cnzgks.com/userfiles/file///lixebasanupi.pdf
    • https://webmakler.org/userfiles/file/kifinarobeku.pdf
    • https://mariellatriolo.it/public/file/dejevopekedaverazitesur.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/78126936577.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://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_off0000dce8.bin
9f4053b57fc725f08018b23df0494f1bb843c784c61b4a6925d3dbd86ca9cb05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 17548 bytes
font_01_sfnt_off00010a9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 16792 bytes
font_02_sfnt_off000122b2.bin
75a8dfb23cc94fc77427c504890c868109536e58adad68ecf84b3aa1d6f36cf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 10608 bytes

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