Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca619d2f6c36877…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 06:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f6647606d00c5f179e0872e6e4c33104 SHA-1: 53b7694c4814e676349de8885fe0019d6a0221e1 SHA-256: eca619d2f6c36877bb0329f7e9d9df4017be283b547b7922cbf6bf4275d5973c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external PDFs hosted on disposable domains, indicating a link farm designed to obscure the final malicious destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. While no scripts were directly extracted, the structure and heuristics suggest it's designed to exploit PDF vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://interreg-ipa-husrb.com/downloads/dunusimimolokexasivefezop.pdf In PDF document text
    • http://debten.net/UserFiles/File/ruwipemizivupusex.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/60471649835.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/68243460146.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ravomemanul.pdfIn PDF document text
    • http://samtekelektrik.com/files/37694924410.pdfIn PDF document text
    • http://xn--12cnpa1crj9cff4b4eybemi0af5u5i.com/ckfinder/images/files/47320519807.pdfIn PDF document text
    • https://grouptm2.com/contents/files/rupixigaguxebefuja.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/86009864521.pdfIn PDF document text
    • http://mobilenmr.com/files/files/zabegenarijiru.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/9900009053.pdfIn PDF document text
    • http://surausa.com/uploads/files/26134939770.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/19383772825.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/xotomekafisudud.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210921053238_1246464159.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/16789966995.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/46124193601.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/sitijopibetitux.pdfIn PDF document text
    • https://moolans.com/uploads/files/96071763116.pdfIn PDF document text
    • http://bandwidth.aryanpalace.com/userfiles/file/70507238277.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/50374837814.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/67103478704.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139f75279b91---58247943827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=disinstallare+aggiornamento+app+androidPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/2380566531.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_off0000b375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB375 16868 bytes
SHA-256: 6ae51f53694c390fca369c364878c4b1dcea00917e741c20b771f4d69666ecb7
font_01_sfnt_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 10736 bytes
SHA-256: 4cd470b113253d334a7f025c4bee1111318766a9727aa4819454139fe2389c1a
font_02_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1