Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ce14aeab3d8b08…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 03:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: caa8f39ac54e0bac66a3e3995e32325a SHA-1: 2d4a7b0fdcf55344e5b7e2a099709c9ab62ebb4a SHA-256: d4ce14aeab3d8b084f45588889d5a0014c57c680354a3648d1c377c83bdcaf09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the high number of external links points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=fortnite+skin+generator+pc PDF link annotation
    • https://7mark3t2-7aya.com/contents/files/tovevo.pdfIn PDF document text
    • https://dacola.com/upload/files/vopis.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210922_D0612192E0CD233B.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/38840067688.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/zekuworezizotewi.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/subapelinojudawewokot.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/loniluzixavewa.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/60648102684.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/bibexodemiviterivege.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16144f3fb66c79---61010522312.pdfIn PDF document text
    • http://konberdbio.com/upload/files/gefejitewamowama.pdfIn PDF document text
    • http://chengzechem.com/upload/files/51614558622.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/vonorawoxamuvaponumi.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/47871282984.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/70569273228.pdfIn PDF document text
    • http://vuason.vn/upload/files/vimobefoxena.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/nexalavinusajufadalumu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146ab820c4---femupugebidozedituvilusiz.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/fefidixenaru.pdfIn PDF document text
    • https://orrizon.ru/images/file/17875186273.pdfIn PDF document text
    • http://nikunjfoundation.org/ckfinder/userfiles/files/nonexakudivatarej.pdfIn PDF document text
    • https://istanajp.com/contents/files/legijuvewuramedal.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/sijokitisetatasozusoterap.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_off0000b2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF3 17060 bytes
SHA-256: b98409acf7352c1b62dd6731addf5b2350c65b203fcc6525aad701d41db2aa07
font_02_sfnt_off0000f6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 10572 bytes
SHA-256: 42cc46d43f33621bf191db7873bf0f54083f7d8bcdc9f40a4ff7d0fedba933b5

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