Malicious PDF — malware analysis report

Static analysis result for SHA-256 581816d278b62a34…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 05:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 47fe7cd345612b198e670a992efef501 SHA-1: 2107f4a681aa76ed3d2ddb69c3ed9d4cf8b6fdb0 SHA-256: 581816d278b62a34a357e60a58904f44d4414fc74cfda19c5975414076bdf238
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with heuristics indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple disposable hosts and UTM parameters in some URLs points towards a campaign aimed at obscuring the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chornakorn-packing.com/ckfinder/userfiles/files/bizugejijegegukidagago.pdf In PDF document text
    • https://agmatbaa.com/upload/files/tajutunomapikemoxi.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/90506181855.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/19012600810.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jexigumegenuzebosejami.pdfIn PDF document text
    • http://ippon.lv/uploads/File/tukukurewavutire.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/95982357064.pdfIn PDF document text
    • http://china-shengbang.com/upload_fck/file/2021-9-22/20210922174827374420.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/3835609507.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/pirewamuxiwaz.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/4374627450.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/47639341276.pdfIn PDF document text
    • http://enricobarraco.com/files/94862476136.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/34467485257.pdfIn PDF document text
    • http://cartopack.com/Images/file/zizewonadop.pdfIn PDF document text
    • http://dnepropress.net/files/file/rajisamugoluwut.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/pazenewagonokojikopes.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/jevunev.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/93006987287.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/rusodazirugegasudede.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/6f40b5646bb069859372df912a159e90/11606031277.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/boxofal.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/zusotelazozon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+9+multiple+usersPDF 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_off0000b2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 10640 bytes
SHA-256: 9cbe2840b50986e658d5da139e1eedae9c547512dbd499870cb6feffa88c81a8
font_02_sfnt_off0000e34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 17156 bytes
SHA-256: 5ae3f4108213c99cecf8f83b49264a9b46a078551c3a8d79d5d7ed05dea2382c

Open this report in the interactive analyzer, or submit your own file for analysis.