Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1bf4b5849bf0a1…

MALICIOUS

PDF

73.7 KB Created: 2021-09-17 16:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 64722a04cfd1964aefcc2cd97a91f8e0 SHA-1: b32ff875c4235f436f07cc94c43b9c9cfe0ce3df SHA-256: 4d1bf4b5849bf0a189653f3afa3f8d235cc7f0283a513384d272ed1806886f2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous external links, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/05113ac17a0f259eb98ec75e4bc44d7c/51296021590.pdf In PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/bizagunivurariradajowiveb.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/77395171769.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/92225241607.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/60574888831.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/vereduxafelebakojex.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/zujeko.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/zazejuvelagapunired.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/95521580593.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/32308614266.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/64810490222.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/tusunefiwok.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/94000525302.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/4760763833.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/65855408010.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/sovoweterodaxekonilone.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/87726837599.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/17430629378.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/migoxotolubesifukato.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/87455640159.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/sazuribitobisefawabuf.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/61473248197.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suwigarani.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/58932489211.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/5109857351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+free+sports+channels+on+firestickPDF 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_off0000bb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 16804 bytes
SHA-256: 9f55fdde74538f220a31ef466cdb390fd6888be9d34dae939cbc690ddfbb842a
font_02_sfnt_off0000ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 10928 bytes
SHA-256: 48171dae28f32433d8359c8cfd551135f8f4d4a6657b25082e750cba22a78aae

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