Malicious PDF — malware analysis report

Static analysis result for SHA-256 156e2410cf254b22…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 00:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 32230505d5beafb00cad78d088d658c5 SHA-1: 8f2277f422f7bfb67dcbed0aaa567b4c2509c903 SHA-256: 156e2410cf254b222444a7cbf084055eaecb4c5154fcddd362d775dc21ce6014
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a link farm or distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a potential SEO manipulation or malware distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://gamepinleri.com/calisma2/files/uploads/81561121996.pdf In PDF document text
    • http://rjbmachinery.com/d/files/kowazipomusulegotonovir.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/69360504181.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/1004936722.pdfIn PDF document text
    • https://photojet.net/userfiles/file/korepijapubumap.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/81284002103.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/ditavif.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/97271253070.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/detujiguzepavuxafufarazi.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/xibugepeg.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/68713619484.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/duzuwis.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/tesovi.pdfIn PDF document text
    • http://abnicum.ru/files/file/xudivufujiwel.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/78457573950.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/filimasoxofax.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/58901652862.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/xudejerutubonudibuj.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/kikinoxorusere.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614417577b60b---sonap.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/xawedidurokobedi.pdfIn PDF document text
    • http://trivio.it/userfiles/files/bebavezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+play+apk+on+iosPDF 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_off0000cba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 10296 bytes
SHA-256: 557e82ed858a12ecfa60aac1f4cea99aba23a8b42ad62127f05f3ae9c5903eaa
font_01_sfnt_off0000e2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 17900 bytes
SHA-256: c85eae265a409d5a2fff00b4a614cec1bfb48f28e4cbed8b6ded9b11fd551241
font_02_sfnt_off000110d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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