Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfdaa6a7055b531…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 18:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad815bf734bcf085649ecd97d24a2655 SHA-1: d4af2fa396f2bc08b8baec0ae7953310133f2495 SHA-256: bcfdaa6a7055b53107a79093baee65247e15b4cf01809599c41d429047b79da7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://seosanhrd.com/userfiles/file/kuworisosajexab.pdf In PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/kapiw.pdfIn PDF document text
    • http://land89.com/ckupload/files/motemig.pdfIn PDF document text
    • http://newmob.it/userfiles/files/legoro.pdfIn PDF document text
    • http://poiskvod.ru/images/file/66256199516.pdfIn PDF document text
    • https://mmtours.si/uploads/xosotekobe.pdfIn PDF document text
    • http://tai-group.com/upload/files/kejatogiwinozaloz.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/dometerebos.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/3178553058.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0aa97c1a663e59a78b145114b59abb73/bubodolosi.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109151703323336.pdfIn PDF document text
    • http://skupka23.ru/upload/m/jalaxatuxozevurox.pdfIn PDF document text
    • https://tsolisp.com/files/file/31038332889.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/88654590739.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/sagiguzewisiz.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/30444068968.pdfIn PDF document text
    • http://vibratingsieve.com/d/files/disagujowisol.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/71560000308.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/60877290040.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/zapejafagivalegotabugos.pdfIn PDF document text
    • http://capital96.com/userfiles/file/majufevogagejirilanig.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/86231297307.pdfIn PDF document text
    • http://electric-kernbichler.at/91771396579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=wifi+very+slow+on+androidPDF 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_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 16916 bytes
SHA-256: 14348eae5fbf05dbcc25eea434f44504e92171cbc07301a5ffe8b9fc86f12726
font_01_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 10508 bytes
SHA-256: f6306a6dd07a2fbf3693c41fc581bac7f13898f73dff13746b796a4f004dc3a5
font_02_sfnt_off000118ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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