Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f519ae0b498917f…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 00:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b50e4d63456f53db9fbc98062f1f7df4 SHA-1: 1420d4c3a1e06bd62af190eb170197ced67cc32d SHA-256: 9f519ae0b498917fd81de98bcf72ce89a75fd47eb218a657e900f51ea74ae50c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute content across many domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pk.mo/userfiles/file/burisuxotulasodevu.pdf In PDF document text
    • http://spec-so.ru/sites/default/files/file/44858332075.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/76606578696.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/77407655601.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/felirifegutefejigog.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/rokizofejajudokex.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/xiwegibexejudikoxila.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/tepajuvobilikovenof.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/8b6092a3e46c173c373b160dc0403e65/kejebopagifupisodomigejon.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/vopipotowesogugema.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/26328555385.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///8930821023.pdfIn PDF document text
    • https://securitydm.com/slicice/file/99162822416.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/mewinafinewositir.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/15323754513.pdfIn PDF document text
    • http://gibisch.org/files/files/57557520686.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/29206064961.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613292cf248bb---83894007269.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/sunukanoduzumuxaw.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/toteriwadore.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/xuwitagaluloradatamava.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/lezogagoxovus.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/piwafepipi.pdfIn PDF document text
    • https://slotpt2.com/contents/files/wowudowowevewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+i+customize+my+ringtone+on+androidPDF 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_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 17620 bytes
SHA-256: 5f15d77330ecd2506b8d3d38f03a95dca5f82af50b2d35071ebf5239d56d3a29
font_01_sfnt_off000113b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCC 11016 bytes
SHA-256: 3d444cb5c83652cdeb582f7ac1b60bd5f4320dd3caad8075433c8967ae5e5323