Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c72000c435ad0b…

MALICIOUS

PDF

72.7 KB Created: 2021-09-20 00:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 396b4fda0597174a280f341f6be6603c SHA-1: b583d9ff0044d210a50179520ab8efdfc9621ea1 SHA-256: 35c72000c435ad0b2b64aad0423dffb450ebb4682f126f83cc4e26978ecda826
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic indicating a link farm suggest the primary goal is to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://archism.ru/uplcv?utm_term=harry+potter+hogwarts+mystery+unlimited+gems+apk+download PDF link annotation
    • https://gloriamus.org/Uploads/userfiles/files/43334295256.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/53388242146.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/40648794546.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/femekenimumukosuvotovepo.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090806050573499.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/figug.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fetetorotoloxapowu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1e174ad5231c90073b2da2c664c183b3/59506720827.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/nemotevatejafuxusukogon.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/miririlolozozije.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091619194470554.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/tageridanubesit.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/bulilupimopulodarewer.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/jisavoxivazekakok.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/80462955693.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/tewelubizo.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/pojotojibotomamixuzaga.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/343118901613bb42993eb6.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/76723090125.pdfIn PDF document text
    • http://didula.ru/img/file/90591676846.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/xugivuzapikud.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/88852696222.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/75078622509.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_off0000b606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB606 11220 bytes
SHA-256: c5bf16202c124f77300fe0d742a9349bea7d80dc35650839bb138541de58ea93
font_01_sfnt_off0000cffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 17504 bytes
SHA-256: 291c307fad3a0b202a0ed4b0d646fa7732bdcd2671f67d42005d1fb8f716f3fc

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