Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfbdee7737a88f7…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 04:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4dab4c89b7007e4a6ac8ad99178a2c7f SHA-1: 99c133e22b0c38a12a19d2769d974bc5e25d9838 SHA-256: bdfbdee7737a88f70948b26afde6ce080bd5d65675beb44a9bb42a5df86d0d71
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://drafthe.ru/uplcv?utm_term=funny+cold+gif PDF link annotation
    • http://saconsultancy.com/userfiles/file/1103946343.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/12471645158.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/16936741890.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/gokolonolapefemi.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/4984758228.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/nodukemudunapigekarasofu.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/19383742045.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/61010155368.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/melilala.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/83059658175.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210902123757.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/getekimofuvotag.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xajusanewowam.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/wujazavepolewakuza.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/bizutusisideti.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/mopogodijuvijakuginesu.pdfIn PDF document text
    • http://hevolta.com/upload/file/fadepuwajabewegav.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ac7f5tvjtq488c9g0uli3grkki/gedureratasuvomabu.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/13526040592.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/37250217132.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/gawatapuren.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/83466075702.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/zorojile.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/wewarovilozugumenagox.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/390ecd2cf65a573af4ac94c7e2a5eda3/98426576376.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_off0000d267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD267 17556 bytes
SHA-256: a7ae11931b2ef61a10e7da46a4b39a13b08dde52686e774b1e3833038b000a1f
font_01_sfnt_off0001001b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 10180 bytes
SHA-256: 41d6b0d913bf39f1a057090830cd2fb5058a5f741e55e0a107aad0809f5e122f
font_02_sfnt_off000116bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1