Malicious PDF — malware analysis report

Static analysis result for SHA-256 f321b36c61a3e1a0…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 15:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f9e66fba6ae6e826d0e4cb1c708ef298 SHA-1: 4bdf5a506ac838be18ab5391be011c3f067057d7 SHA-256: f321b36c61a3e1a03287f90b717cdddefd7783597d677527393e5c4ae6e10e08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to download other PDF files, some of which are hosted on suspicious domains. The presence of these links suggests an attempt to distribute malicious content or phish for information, likely related to Android applications given the UTM parameters found in one URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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.
  • 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 http://paulabenveniste.com/UserFiles/file/sareniwaka.pdf In PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/43388209974.pdfIn PDF document text
    • http://upakuika.com/img/file/55795110749.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/muroj.pdfIn PDF document text
    • https://scalper.ir/data/files/file/tasiwuliwedinezixu.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zazibelenonidamixoxupife.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/98048119564.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/52024762499.pdfIn PDF document text
    • https://riwg.in/userfiles/file/pekogimuzinesa.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/ferovisexagififizetajekog.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/47278859700.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/dipidoxo.pdfIn PDF document text
    • https://haidangpc.com/contents/files/sewim.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/gubabozum.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/gaxefos.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/46507350907.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/kokakalejiwomorelid.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/bobivetafesakatutefitige.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/beduwoneralixas.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/56716497347.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/65521707973.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/bodox.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/dafowofutuforifamowove.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/56533236588.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/60054584480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=blackmart+apk+free+download+for+android+latest+versionPDF 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_off0000afed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFED 14784 bytes
SHA-256: e157a0cbb0927b9e58333b46ae4dd9ec4478174df51a616630f2da91eb0eabdd
font_01_sfnt_off0000d52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 11080 bytes
SHA-256: fc63e2990a21efaa9dcebc961bb237aa91c429182ba2793b931afbe01ee333cb
font_02_sfnt_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1