Malicious PDF — malware analysis report

Static analysis result for SHA-256 499e0dca9f599386…

MALICIOUS

PDF

90.6 KB Created: 2021-09-17 21:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 97286a86ecf83b3535649dbf2e5a55e2 SHA-1: 81eaa361298b4b146a1d5c217bb68ae06635d7d6 SHA-256: 499e0dca9f599386abab6f298905d3c042627af5f9200c4d4107dc99f93683b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm designed to host numerous links on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://taxforce.nl/userfiles/files/38686513469.pdf In PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d39764ec247e18be7476de75baeeeaa/noxesoxiw.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/zelitizepazewobibose.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/duxupajajavaxuxekejimuwil.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/bigevij.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409047c8a69---96311708880.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/zixizidalesumesepoduguj.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/92985462245.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/lofejexuwefowepazedujopuf.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/wezute.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/94648242891.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210910235351.pdfIn PDF document text
    • http://eventechsite.com/files/files/31871400811.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/jujogoka.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/54661035328.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/54579197851.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/35355277529.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/zusokitenojamu.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/58030408383.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/savudutuwogidejosukux.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/16374819774.pdfIn PDF document text
    • http://test-immo.com/file/17868655039.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/batatiwotesug.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/gulisojarokeduxo.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/5271233813.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/43148974885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+manually+transfer+data+from+android+to+iphonePDF 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_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 17820 bytes
SHA-256: 0c8a35ac3a953382b97475be566b34a04c383dfa08ceafd4c527bf59984cb531
font_02_sfnt_off000142db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DB 11056 bytes
SHA-256: 00486ceff49b20f94b23937d03b78c2e6fcecd917925f4889e7b32a94c71e4cf