Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df1b21328c90959…

MALICIOUS

PDF

77.0 KB Created: 2021-09-10 18:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ef97ac456d39b4d19abae4c6c1b6b2d SHA-1: 090eba813f0aa5cfdfa5a7aef609abe36655e093 SHA-256: 9df1b21328c909592535902aa642bef03d40cb18cf4ebdceefe2fa9cd0f2a9f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URLs, including one with a 'utm_term' parameter suggesting a phishing lure, point to external sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document functions as a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=dragon+mania+legends+hack+pc PDF link annotation
    • http://herbexindia.com/ckfinder/userfiles/files/92236788659.pdfIn PDF document text
    • https://sapporopools.com/contents/files/99501429738.pdfIn PDF document text
    • https://breedlife.com/upload/files/wanevujededitub.pdfIn PDF document text
    • https://granitnet.hu/editor_up/worimakero.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/zefedosit.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/60904397494.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/gaxoxugataxemiso.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/pedotutisegol.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/dotejezenutovuzotupalij.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/zelabedoxidire.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161367fd7ecb56---42810578846.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/vuvawejimabamijujoregufup.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55787113586.pdfIn PDF document text
    • http://saydersan.com/firma/files/tuvajokiranuxidim.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210904231727.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382a28694ee---83601397685.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/porizez.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/miravutejela.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/limiveromiposimigutut.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/pineseteven.pdfIn PDF document text
    • https://norservis.info/files/files/60202241054.pdfIn PDF document text
    • http://fertilizerproductionprocess.com/d/files/lolibiperawanig.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/guxovogusotuvazoxakulaja.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_off0000c7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CE 17468 bytes
SHA-256: 9adac2cecf453e696b1e3d3252ae0f3d75462e9dc3b3366a73130fba4ef92a92
font_01_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 10956 bytes
SHA-256: 6e4820077cd5e261e8c6a7bd5a1dad5cfceaebaf98fa1c5735653c29298ef630
font_02_sfnt_off00010e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1