Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b97d7d3c33772a…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 00:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d3e345d218b32ede8dcda14a96b7eec9 SHA-1: fc4ceae232d55f724a023b2a095ca7877b50379d SHA-256: 85b97d7d3c33772ad0668b85099ddf6bad966a219aafe02a2720132fe8210ddd
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. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to direct users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://leifs-auto.dk/images/file/sixilumunuzogulidimuga.pdf In PDF document text
    • https://lotusmarinevn.com/upload/files/31912653780.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/sonij.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99518644743.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/favabipabamemu.pdfIn PDF document text
    • http://jucal.es/images/file/72163339608.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/60521949713.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/68235738794.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/powivotu.pdfIn PDF document text
    • https://duel.pl/userfiles/file/3600329213.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/46990424767.pdfIn PDF document text
    • http://medica-brno.com/files/gopupav.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/99845440136.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/14248505564.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/tazijokojirel.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/mojatode.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/32026878940.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/xobilezefubisuvetuwiju.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/76022961564.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133254ab0504---dekumemamimasawugajuwixo.pdfIn PDF document text
    • http://reopen911.info/media/file/26552711851.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/pedoreganokuvupukosu.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/69376761379.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/45013724249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=2+corinthians+12+commentary+easy+englishPDF 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_off0000b275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB275 15264 bytes
SHA-256: 4e732d4764b582492c2055073ad62faf33b2453d0deb8025a00c0555fd436375
font_01_sfnt_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 10868 bytes
SHA-256: afd128e8da7c0cee9e7e26179ce44cd66a5a7b6452356482c8f7acda25e70e17
font_02_sfnt_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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