Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3509353363917e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-17 09:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f5dfff0c3d1e0e22f6b59b0e44d1c6e SHA-1: ba4f1f2bd8044033ba96f4b484671fc253c85f74 SHA-256: 3e3509353363917e0c55522ba42e9a901471ca768e35b6e6d06fd9cfe849486d
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used to obscure malicious destinations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/uplcv?utm_term=redmi+note+9+pro+price+in+pakistan+2021 PDF link annotation
    • http://www.sictombbi.fr/ckfinder/userfiles/files/81443168989.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210906/file/16309406535989.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/xagogizuvekijebof.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/13235853467.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/6947432291.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ee12512bf---68591408671.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/julikeborokepilifat.pdfIn PDF document text
    • http://only-svet.ru/upload/files/mudiragegudejabulumino.pdfIn PDF document text
    • http://okvin.org/userfiles/file/84562324489.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/75031758423.pdfIn PDF document text
    • http://recviem.ru/img/upload/72529374208.pdfIn PDF document text
    • http://cobmedia.hu/include/vemap.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/30369091994.pdfIn PDF document text
    • http://jucal.es/images/file/bofanotuvopotalajupizumax.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/92103846469.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b3cce8a1a76f81818667126ddc2c9177/dikobutekige.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/liguvorinatikiruriwutino.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/konixiropidasufalitibuv.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/katofasinu.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/wegawej.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_off0000b3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AC 11228 bytes
SHA-256: 13c92d20e683eaf683574411a85261be92cc7e2bc27ea879551f15eec379f48a
font_01_sfnt_off0000ce0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 15708 bytes
SHA-256: e018facb0c6b8dde88737c555e238474700269fe201abcb79fd1fcaec0402a71
font_02_sfnt_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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