Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b50390b4163c0a5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 08:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1c80dcde21c40ccce161a0eca83bfed SHA-1: 0c9923708915ee4545b3a8b276ae07055d40b6e1 SHA-256: 7b50390b4163c0a59d0074b574e5508a7cab8de5bbfc5349db99c2e4d67a01fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 distinct domains, many of which are disposable. The presence of many unknown reputation URLs supports the conclusion that this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cncunse.com/d/files/51089260573.pdf In PDF document text
    • http://xaydunglenguyen.vn/upload/files/55d5e1.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/wudolazukupipezapuwotek.pdfIn PDF document text
    • http://teplospectr.ru/images/files/77470914430.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/felojozijep.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/64551736419.pdfIn PDF document text
    • http://domario.ru/userfiles/file/90476691249.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/vofikonuzawajiri.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/musabemugowefefudu.pdfIn PDF document text
    • https://fond.ru/userfiles/file/90678507227.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/dugesejixiv.pdfIn PDF document text
    • http://sivam.pl/files/file/gimexogepuk.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/telopelaxoxazanadu.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/57376916781.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/89871749220.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/xitapafavijuf.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/susofib.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/67976035427.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/4387723c68ff4a1c03366707e9a1cbc6/noxubu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614521dcbb956---regisumenopovovopi.pdfIn PDF document text
    • http://chamdure.com/DATA/files/falumotosawusonajonazema.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/94724183027.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/vuxakupa.pdfIn PDF document text
    • http://maxbrio.kr/files/files/taverozal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=live+traffic+app+androidPDF 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_off0000d7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F0 10420 bytes
SHA-256: 061e60b5a848344f0f5abf4ab10634a27b37f180a480d22eef0f9cc75ad70b20
font_01_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 18308 bytes
SHA-256: f9e8cf7e29bceac07fefd8911e164481993f95785a6a49df1d6832709c3764b2
font_02_sfnt_off00011fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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