Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf01143c7a4422d…

MALICIOUS

PDF

72.4 KB Created: 2021-09-18 10:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49a27bc9a84a8fec8ee48f9aeb460fe9 SHA-1: e26172263a6ea1ffd099c4715672a57ca5c9a470 SHA-256: ebf01143c7a4422d3184a9391f4cffbff53ae4ee79f7a97be2ae2ec518adc8d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. The presence of numerous links to potentially disposable domains suggests an attempt to create a link farm, likely to host malicious content or redirect users to phishing sites. No scripts were extracted, but the PDF structure and heuristics indicate a malicious intent to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://tnhmc.com/userfiles/file/32476828025.pdf In PDF document text
    • http://nousgarage.com/userfiles/file/xenikelazaxitagiroro.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/verisanenuk.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/golawiluxunekeki.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/57321208248.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/79568865151.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/jenuwawepirerunama.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340a61a46b4---peponawimevesufokim.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/74071554009.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16313106887bcc2c7c6c4813425267.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16142a005f3a1f---nomamas.pdfIn PDF document text
    • https://subded.org/userfiles/file/rarigotovafutonimi.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/90395727687.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/10509997642.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/bawuj.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/wolezibumarosiled.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/vitamopelot.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/xixunigugetapi.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/2109180804006237580hk9g.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/27586738900.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/zekezokidija.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/puvagadaverevamejexagaz.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/bazevimipej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=chloroprene+rubber+propertiesPDF 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_off0000ba39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA39 16348 bytes
SHA-256: 26745f1eb20cea6e6935679df4b14164a47c26f131afda49474a2d8f149a89d0
font_01_sfnt_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 10456 bytes
SHA-256: 56ab08bea4f83b85d830080c56e956dbae1f85a4a108adacd186fb9f8746dbf7

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