Malicious PDF — malware analysis report

Static analysis result for SHA-256 4791d2053f03ea20…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 15:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 001eb6fc91be7eaf87abad7d951a6d69 SHA-1: 1848425d91b02d5f8fbcf52513a6c7f49d40a484 SHA-256: 4791d2053f03ea2053234b0b6e5ef86944c70b5fcfd3dce1b5ace1286f96cb76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially malicious domains or link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content, though obfuscated, are consistent with attempts to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=ir+blaster+on+my+phone PDF link annotation
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/92421012399.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/jasizatoluzuxavunenisada.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/fenolokuvebiviw.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rugijixakunutibu.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/67414676872.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/63891350135.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/17140570259.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/27489208418.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/tigosuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614942263b398---26194914987.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/wigowuduwurivi.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/guwojodetelafovozepoba.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/12569174455.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/98595788211.pdfIn PDF document text
    • http://e-sportis.com/images/upload/56868746485.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/lexokiper.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/59827994902.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/dorebasereded.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/vulev.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140942515690---davevafarudogowan.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/gibokomezefewekem.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/mutupekimititikalazivo.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/fiwufo.pdfIn PDF document text
    • https://goodline.by/userfiles/file/retufepirifudujogik.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/zagosabidedisi.pdfIn PDF document text
    • 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_off0000b190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB190 14624 bytes
SHA-256: c80ca5577de3ca6739a4d1b2d010ff8459f758c5f45cb488b60a2d23d8b66d95
font_01_sfnt_off0000d650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 10632 bytes
SHA-256: 7dff877a3e19040be04e8db0c144f2e6ebd58106ac0a4744ab48d9d8b0d338bf
font_02_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1