Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb7b587d73cbd85…

MALICIOUS

PDF

81.4 KB Created: 2021-10-08 03:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 34ca6a830f9e118ec76911febd6fe039 SHA-1: aa2a70b2ba9a68e1465e2b3a6b4296404ad53b1a SHA-256: 5eb7b587d73cbd8503ccb795f1e22c9f2c88fab8e3bde6b6666e90b5b17d0eae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the overall structure suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=who+is+your+olympian+parent+quiz PDF link annotation
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/6465248694.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/wiwekirobolamusisipoxajo.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/zavogavuzatefinudujoligov.pdfIn PDF document text
    • http://toroisg.com/public/images/files/datuzevomudop.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/lijovu.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/malizapajewulas.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/gapalizukub.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/44347536644.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/75966538472.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/49786280105.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/97114561839.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/rejabirogoze.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/68748055866.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425c8a393cb---tutagazajudusip.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/lodoveravujulaganuf.pdfIn PDF document text
    • http://fxlcd.com/upload/file/bubefofetipakosoj.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/12065035526.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210913213450.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/tiwosanetozilulerejasosek.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/91595494864.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/91158174281.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/pemelimojeji.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210911010916.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/vusopogiwupatilapud.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_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 10928 bytes
SHA-256: 5fdf6f8d40ca5e692a362c23a4e7407a7bde9f20f235b25c055b69463d6da74f
font_01_sfnt_off0000f112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF112 18448 bytes
SHA-256: 143696ef00edaa47cce8ebb3175534af3be31f0c4fecad973518928f454a0bc4
font_02_sfnt_off00012044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1