Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe325b890dad431e…

MALICIOUS

PDF

69.6 KB Created: 2021-09-21 00:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8efd77db976a48da35ac80e17678a85d SHA-1: 307e324cbfd1c88684304dea5f4727b47b891a16 SHA-256: fe325b890dad431e78e7b1c7a2e8ce17f91dd2cbc5e6b7ef3b2868ae38eff72d
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. While the document body is heavily obfuscated and unreadable, the presence of these links and the heuristic firings suggest a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://aggengr.com/uploads/CMS/file/mofonovijepatugomotig.pdf In PDF document text
    • https://stmarys-perthamboy.com/upload/File/pijovi.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210907073602.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/gixivewujozigizi.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/depiseroge.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/77672996571.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/sefakirojubatiteb.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/58127656078.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/fezofajajaxerojevilotovat.pdfIn PDF document text
    • https://grouptm2.com/contents/files/27179963821.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/bipavubunamukewamome.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/373719902.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/fipakapuj.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/roxis.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/vevukemoziroruwanak.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/84572606877.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/vorulagolobunota.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/96776480534.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/lamutonuzegudutubetemaz.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/rexevapot.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/23647707369.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/zarizudukupumubitazowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+audio+visualizer+in+androidPDF 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_off0000af1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1A 15832 bytes
SHA-256: 07bdce23f37a81b45735e94cca122fd29dabfc4b150084f4120df91e04c1404c
font_01_sfnt_off0000d7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DA 10804 bytes
SHA-256: 0893096b5b64f7b3ba8170b87fe4171b1f58c31539858618f618d302ef4ac80a
font_02_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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