Malicious PDF — malware analysis report

Static analysis result for SHA-256 4deb1417881bf868…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 19:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4848497098c175d4fa20f271c2f23750 SHA-1: b6a5fc879b262deafe8a46f727300f83f714f2fe SHA-256: 4deb1417881bf868ad4cbe0a74a7f3c8de088bc4ad5502c4ea74950791737894
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious content or phish for credentials. No scripts were extracted, but the presence of many external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=world+of+dragon+nest+apk PDF link annotation
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/57884324354.pdfIn PDF document text
    • http://www.siposferenc.hu/html/3421606164.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/lajasorepiporufe.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/kozusejopovorugoj.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/duviza.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/guwaxerumerakiwo.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/74661321782.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/renisedufogotamemomavex.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109062226017095.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/wojosiretulufofuperimopu.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/turelubipezidoroso.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/81478521658.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400a312965c---zowenez.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/tafodizexuk.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/57988424329.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/gapafivob.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/40518998183.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/takuvakeziwukoxagidit.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/14956304816.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210908001353134187poxfr.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/2936251365.pdfIn PDF document text
    • http://ty-int.com/files/files/wezenunofiwomijasisik.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/zorasezizoma.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/jitibisu.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/sigimegereze.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_off0000d353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 10668 bytes
SHA-256: 180503cc02f6d69d42737b91b1765e910206a9da433b99d41b45526ef41fe174
font_02_sfnt_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 20796 bytes
SHA-256: 8154a1df8557445d4528af2c4cdec8f3dcf49292c516b2be6972b118d889056c