Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8fa9d69df80e77…

MALICIOUS

PDF

84.1 KB Created: 2021-09-10 21:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c51f597d6c22eefe0446439b96260de SHA-1: 5052f29c18dbe09ac0c24994ac4521c9499a285c SHA-256: 8a8fa9d69df80e771356ee5642ba3d1ee1efd5af69ced5c2798e6dd3cc95b95e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as a phishing trojan and ML classifier. It contains numerous embedded URLs, many of which point to link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting multiple PDFs on distinct, potentially malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://hotdeals24x7.com/ci/userfiles/files/77824907367.pdf In PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/42515695329.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/20195735479.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/wewizulapowivozamuxojewo.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/894104256134550f64e90.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/89296468187.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0c375f41---kovanojabuxuzuxo.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/19405027188.pdfIn PDF document text
    • http://dr-temt.ru/images/file/jatizexubujufen.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/54187591527.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/ramamobemuwalumu.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/sapugefogufoti.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/64564690448.pdfIn PDF document text
    • http://airsoft1.ro/files/file/gogavewubirobu.pdfIn PDF document text
    • https://people11people.gr/uploads/File/50928433799.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/83298751041.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/motejexe.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210910_11FA4EF1C2418562.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/29305282877.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/30260042656.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/99433942837.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/janifigisujawovesimigi.pdfIn PDF document text
    • http://12shio5.com/contents/files/wiruzama.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/fesataruv.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-4/20210904164550227308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=bubble+cloud+tile+launcher+watch+facePDF 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_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 18520 bytes
SHA-256: 6b8c02b4b1aa3326e89333d9ae161be92ccd360dbdbc1eae13dcf08bb8253110
font_01_sfnt_off0001116d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12984 10784 bytes
SHA-256: fb6a3927b6804184485d78f278f8b7dae80c1d6bf8af1235eccbd96604d30ba3