Malicious PDF — malware analysis report

Static analysis result for SHA-256 c543c798ef0cde21…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 23:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cd830706272c5496d16191be75d6437d SHA-1: b4808d5f560151bbd3eae2b0b59726aba8b22451 SHA-256: c543c798ef0cde21ef92ce0c25b05cec39b648e75df3b9dc0a60304a27270d6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the use of such techniques to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ketchas.ru/uplcv?utm_term=ppsx+to+pdf+converter+online PDF link annotation
    • https://suadienlanhhanoi.net/upload/files/92314645938.pdfIn PDF document text
    • https://istanajp.com/contents/files/13698954727.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/1835792333.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/78328762829.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/30982782764.pdfIn PDF document text
    • http://soles2walk.com/data/file/letebivitibuvinel.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a95d3c559ff8744d69f7292032f369c5/nozewonolebuzab.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631471294.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/56942492343.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/79538713857.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/94174287334.pdfIn PDF document text
    • https://e-midas.ro/files/file/49555345620.pdfIn PDF document text
    • https://kham.vn/userfiles/file/siwulelivowal.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/50199426630.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/popezimugujozikuf.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_off0000afd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD9 10620 bytes
SHA-256: 46db1f99e35c607be91af6f0898e6cb60e25a28b967cf699892e0f8eefc4c9a3
font_01_sfnt_off0000c846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC846 17864 bytes
SHA-256: cdc17acc874e5e224c8f3dc6c610afa36d0cae1404852b11a9ee003f468fd14c
font_02_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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