Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bad71c50dc2bb4b…

MALICIOUS

PDF

86.1 KB Created: 2021-09-19 01:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8a725f4b79b16df20160f07747251332 SHA-1: baf3b6cf9bf69f94119cdb555095ff480a828ac1 SHA-256: 1bad71c50dc2bb4bb9f67a282e4ccdcb78cc7b2f83e7c6c6015940ec875494b6
146 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, exhibiting malformed stream lengths indicative of exploit activity. It contains numerous embedded URLs pointing to various PDF files hosted on potentially disposable domains, suggesting a link farm or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://mehfermobilsaglik.com/userfiles/file/22166639382.pdf In PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/12973756553.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/27852010235.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/nimolubugi.pdfIn PDF document text
    • http://geodez.com/pliki/file/41124681959.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/30425371610.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/bepesejazigugijol.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/reseraw.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a37df48cc06c429af643cba398190c31/pamapadegojijifi.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/wapawubesotuvenodu.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/28308139137.pdfIn PDF document text
    • https://samowar.me/upload/file/20622171341.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143be717b251---1852444261.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/15234163883.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/gotelizejudokowonadifu.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/momobunamolus.pdfIn PDF document text
    • http://langmypham.com/luutru/files/39688905932.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/bonixaluwamonudu.pdfIn PDF document text
    • https://robertbah.si/files/file/12490209318.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/solijazogozomifegavowot.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/26031956568.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/84587310124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gemini+movies+tv+telugu+live+streaming+online+freePDF 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_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 10760 bytes
SHA-256: 412b8912f62b40da746207b5c4e3fc9dcbb57d66f19de2a09139b3f58d7528a1
font_01_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC2 18508 bytes
SHA-256: 9de6e3b6dbfd9d5485ab52450d609488e4aaac35cdb5c99c495fb5e3f1bb5d1f