Malicious PDF — malware analysis report

Static analysis result for SHA-256 47bb6c613aa2421e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 13:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1cb5ada5124c227a5be71d98510913ad SHA-1: c46421d909195d510c2648fa59a27b6082b14c8d SHA-256: 47bb6c613aa2421eac872db9f0d771b4005a747a4ff714b367701454aba69287
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to domains that appear to be part of a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pistant.ru/uplcv?utm_term=injustice+apk+obb PDF link annotation
    • http://xn--dlek-5qa.com/admin/UserFiles/file/3725585096.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/34677379137.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/talumez.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/37171468330.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135309040033---24518772860.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/80521726720.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/xaxozilugudivogevu.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/47672768363.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/19206361911.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/57336926890.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/69958185924.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109031843236497.pdfIn PDF document text
    • https://laps.pl/userfiles/file/dutuwe.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/83910466638.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/69706459851.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16145562300b10---58591030745.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/kasuvogonosadutosobodegop.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/79847823957.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210903_145117.pdfIn PDF document text
    • http://apsons.eu/files/file/sufivesokezevajitu.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/jepunoxeridigilofesowirub.pdfIn PDF document text
    • http://temple.mo/userfiles/file/lomojejegulekas.pdfIn PDF document text
    • http://www.heksan.com.pl/file/13477611140.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/kogobimunana.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_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 10636 bytes
SHA-256: 3e1589c760a9ec650fd254a41d207ae86db3fa82f30d5e9bb2f07b4bd4ca8ebb
font_02_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 18028 bytes
SHA-256: fb13a546ff547460f16520f4ad23d1d493378348dc6b7f591fb1f60b2246864c