Malicious PDF — malware analysis report

Static analysis result for SHA-256 83234ad649a54332…

MALICIOUS

PDF

73.9 KB Created: 2021-09-28 19:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a7bad54bbbdc279232ee0a412568f591 SHA-1: 93e824b10a2018821e8289bc4cf7456d4b696cde SHA-256: 83234ad649a543321726bd59557be32e90496172beadb21d33bbbe621fa26383
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pixomot.ru/uplcv?utm_term=telecharger+gta+san+andreas+sur+tablette+android+gratuit PDF link annotation
    • http://diadiemvui.com/upload/files/66199266732.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/43592100076.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/pofojid.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/71504598976.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/23489116032.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/jetowasaruwulifime.pdfIn PDF document text
    • http://rapet.hu/files/76473297028.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/46554298890.pdfIn PDF document text
    • https://emmaushuis.org/pages/8652683010.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/52919020285.pdfIn PDF document text
    • http://eva.am/files/2f2deff3955dc04c.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/40075134085.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/21824296765.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/tudobuwa.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/80267068637.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/10117114857.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/18203860468.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/wunesowibafesepamov.pdfIn PDF document text
    • http://ingore.cn/upload/files/zobevoperali.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/rulotoretiguviva.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/sasixobonot.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_off0000b850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD062 18544 bytes
SHA-256: 3f2219f14f552e53891c851fa457720697d1ee5678169d852777e1d458ce266b
font_02_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 10852 bytes
SHA-256: 8d4e8329532014fea4b38eb4b0746a09d4d56fb025caac9c3b95bc9c1e0b8dba

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