Malicious PDF — malware analysis report

Static analysis result for SHA-256 513d632d6b079a87…

MALICIOUS

PDF

90.4 KB Created: 2021-09-08 13:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bbacc2328aabfcd12a58f7065231044d SHA-1: e56f534c73e6be22cd5b1eb402c70ddc726be33d SHA-256: 513d632d6b079a8719043be5740f7876c548c2838ddf38ef06ad4326d5842f54
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating malicious intent, including random and disposable URLs, and a high ML classification score. ClamAV also detected it as Pdf.Phishing.Trojan. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=dmexco+programm+2018+pdf PDF link annotation
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad48b0d1d---peduraredituve.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/84071573728.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/litemorege.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/79302297265.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/pusubavubixezujenudosu.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/gegesemejilamazewid.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/jupevuxugib.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/ximenizodokupije.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/vimabu.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/xasamijawipano.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/30935519901.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/48497819611.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/28373424427.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/9182432060.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/zuliworetov.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/89016018062.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/10508255873.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/73430015410.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/64043468874.pdfIn PDF document text
    • http://farashimirooz.com/files/wevobasokerew.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/62124263691.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/97058433044.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/wuwegur.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/80708032650.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_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 11060 bytes
SHA-256: 85e0ac816361e0538a5571d3fe61921c31cf14af616d7c386501a580dbcea1a1
font_01_sfnt_off00010dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 20484 bytes
SHA-256: da822cba4013fbeeb47605341250be9f3fd61767365012f9875ba59767b3d9a2
font_02_sfnt_off00014383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1