Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ccfeb3e35faf0a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 17:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 432591af231fa312399a88f4f1394ca6 SHA-1: c45743830b3ee71cdfba5276796b323a26c99f8e SHA-256: b2ccfeb3e35faf0aa8f6c72624e620ae182693f1c85d14693e1646369f004dd4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on various domains. The presence of embedded URLs and the overall structure suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://infypos.com/infyposcms/media/77946118327.pdf In PDF document text
    • https://marbletreasures.com/uploads/image/files/50019958603.pdfIn PDF document text
    • http://maksimetall.ru/files/sazedugitifo.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/32156555704.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210908065920.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/jumajodofupox.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/fazelemuderaxetutena.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/tesiwobekebi.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/44842820344.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/voridime.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/mugapupu.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/73997916255.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/duzituposirulafudoroguv.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/nowevazikuzimifevu.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109071728237153.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/46462507310.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/99186929216.pdfIn PDF document text
    • http://araonline.hu/uploads/file/tusawofazesibodakijurofe.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/sogifokonokumurovovov.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/naferekejelas.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/42060098089.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379d64c612b---lobakegisaxumitefulupomi.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/jifagasavu.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/95767356359.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/lulufadizupevinuruj.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/duxifabifonexogazadi.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210904110235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=fifa+21+pack+opener+mod+apkPDF 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_off0000dec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 10708 bytes
SHA-256: d3281965b2d5540e7f6f4c246099077863257a658692f6940efe963cbb600d7b
font_01_sfnt_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6E 17852 bytes
SHA-256: 2d04cff4de0d841be0a7a2cb0941cb11b429dc73d45b41ef7f147851fb57c2e5