Malicious PDF — malware analysis report

Static analysis result for SHA-256 06008779db9d0a50…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 05:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 21ce2aa03a4f255dfcbc6d99a62bb061 SHA-1: 14a0d406b6220cbfe8e73f09f3b78e2864ac77aa SHA-256: 06008779db9d0a505055915a84f16331639f57e76b44661e1889ec8af5068e32
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous PDFs on disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of many unknown URLs further supports this, as they likely lead to further malicious stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/fbf10ffa46cb6289b08116133b859a71/78183933412.pdf In PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/zobivikalopojogepemopezow.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/17617885272.pdfIn PDF document text
    • https://ratoempat.com/contents/files/zodudarazukanisotazogoju.pdfIn PDF document text
    • http://nomortiga.com/contents/files/japowep.pdfIn PDF document text
    • http://termocity.by/pics/files/zefejedukulutadop.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/vedelexubonub.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/69783257757.pdfIn PDF document text
    • https://invision.buzyhub.com/files/42398297771.pdfIn PDF document text
    • http://jonellchem.com/upload/files/gawunujovulopawagu.pdfIn PDF document text
    • https://zagi.hr/files/ginunavejazopowivatadu.pdfIn PDF document text
    • http://maxbrio.kr/files/files/95562053963.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ddb431e71b98c7ef1df56666b792d384/nelodamif.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/zonawadutudimomovifefuwev.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/vozuwasitopu.pdfIn PDF document text
    • http://3asoft.vn/img/files/60687679059.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109032233099627.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/kololoxadifubesogeje.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/nadexepajufusupilakawepal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+body+keeps+the+score+pdf+downloadPDF 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_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 11020 bytes
SHA-256: 8a5addf4db147774d1f11ee427bd77d4b037fd3d05af7d54a287837acfbaf1c4
font_02_sfnt_off000106df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 18208 bytes
SHA-256: d006ab99027a02b7a1109e2ad3165094dbf12b782f9e5065e71d46c78f57218d

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