Malicious PDF — malware analysis report

Static analysis result for SHA-256 b368fcc25bccecec…

MALICIOUS

PDF

74.2 KB Created: 2021-10-08 04:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d8a7175482b1da49d4159cf54bddd6dd SHA-1: f4aaeb5ae8c1db14704d9c6bcd97f63d201aaf04 SHA-256: b368fcc25bccececa482bd4a2f4df16dd61ad9d5f9e0fab59e4d438502dc5398
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host numerous links, likely leading to phishing sites or malware downloads. While no scripts were explicitly extracted, the PDF structure and the presence of numerous unknown URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/72f564920d8be4d5847163870586f670/24584748768.pdf In PDF document text
    • http://lgassociates.in/uploads/41287543757.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/64467028323.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/47731308781.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/mutudupokusebutero.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/36292569312.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/derefezikofavovaguxabib.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/1845540036.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/36059976066.pdfIn PDF document text
    • http://simoncaulkin.com/images/15299776105.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/kozefajowi.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/64844119117.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/fuziduwipoji.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/tutowedodurezimegoripa.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/migitipul.pdfIn PDF document text
    • https://reha.bg/content/upload/file/51558060945.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/8435482532.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/62802833200.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/gubarijit.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/41612664140.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/walasadiniworovibife.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/20332098568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=transmission+and+distribution+of+electrical+power+book+pdfPDF 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_off0000bbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB8 17484 bytes
SHA-256: 9cc1137ffb0ba04f571f472739184225a860bd525721718342ddc609d58d6548
font_01_sfnt_off0000e8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 11160 bytes
SHA-256: 84a3da2aabae2cef3bb400b49f6824057f734c84df24679e1d379fb8da8661da

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