Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd60b8638477389…

MALICIOUS

PDF

81.2 KB Created: 2021-09-22 21:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e09406f27e65e7e693b53d2ab5f9889 SHA-1: 671c0fa8235f4368ce7bc262412e4871cfa7a2cb SHA-256: fdd60b8638477389d1162918f30cfa3948231cea76eba3f8a3363f6f42afb1db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external sites, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a large number of links on disposable hosting, a common tactic for distributing malicious content or conducting phishing campaigns. No scripts were extracted, but the overall structure and URL distribution point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://masterkontroll.hu/ckfinder/userfiles/files/46537558512.pdf In PDF document text
    • http://kmsenior.org/file/files/xukopazetaku.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/sojufukofuzabupesavunuwu.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/8227212527.pdfIn PDF document text
    • https://iword.de/userfiles/file/69950351021.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/vatudowobigunutuka.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/49008915728.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/4480427987.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135c2f9c9a57---bozudaferujixa.pdfIn PDF document text
    • http://www.siposferenc.hu/html/81480445922.pdfIn PDF document text
    • http://actinq.nl/upload/file/sinujenitepinabe.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/83783686040.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/lazuzovos.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/nukumorarejatebubamub.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109100301376240.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/gabaripaxinegazu.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/64390741476.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/53891611577.pdfIn PDF document text
    • https://istanajp.com/contents/files/jenug.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/69260876338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=world+no+1+action+gamePDF 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_off0000d964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 17960 bytes
SHA-256: 2abb3da8424c5d461900c8633038cd26fa39d9b36c68ac0733154a790ab67b10
font_01_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 10592 bytes
SHA-256: 65085d5b4b841798dcb8a1a9aa9d670bce7e4e18c0702a31f0eb95f380a30fae
font_02_sfnt_off00011fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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