Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b4bf653ec7900d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 21:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1dd5d718ff6482cc93cc18cc7650bcbc SHA-1: 2877dda60d560b97ee994fceb5ee8a18d7abf638 SHA-256: 87b4bf653ec7900d257da40d03a717554ac4c945bec99214943b3ef31beef475
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous disposable domains, suggesting a phishing or malware distribution campaign. While no scripts were directly extracted, the PDF structure and external URI findings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gionggiacam.com/ckfinder/userfiles/files/xibozanazisikuzu.pdf In PDF document text
    • http://nenayu.com/filespath/files/20210902015306.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/6221120220.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/38999290530.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/75550040862.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/83680669580.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/nukoregolarelikaf.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/47819623662.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/dulurarupimatigufanapuduv.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/zosegojopadenovukovezewa.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8a128f6c0bb3ce69dd1f32e215f62ec1/rubudawoxisuxe.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/pexemelozedopefa.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/xamitinid.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/lolonalokad.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/49949349030.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/zulevupekujojaba.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/sepajofilivumajaderot.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/18068351675.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/21711089961.pdfIn PDF document text
    • https://congchung7.vn/upload/file/pajup.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/dazefuron.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/84307177164.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131584b0ee4d---laxiridozezetu.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/risodel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+hound+of+the+baskervilles+questions+and+answers+pdfPDF 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_off0000d32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32F 11188 bytes
SHA-256: 8641dd75a39222c6c664fca913df7c9ca9f080afd570c50f99d7646cfab0e524
font_01_sfnt_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 17412 bytes
SHA-256: e40af00e541b587e508c18e836e1082dd6c628f6bf8b6934557794b44bb115b2
font_02_sfnt_off00011a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1