Malicious PDF — malware analysis report

Static analysis result for SHA-256 125f6686f625e9d7…

MALICIOUS

PDF

78.5 KB Created: 2021-09-22 09:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 545613d4f3ddd73a6b175554b8af3e37 SHA-1: 57b6c2c22164c509b4b67459e7c5ea6da1c7ba90 SHA-256: 125f6686f625e9d71f7f4dd705904be9ca7c01478e709232c148564ca2163074
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs that point to external resources, many of which are structured as link farms. The presence of these links and the overall detection suggest the document is designed to redirect users to potentially harmful websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=ps+touch+apk+premium PDF link annotation
    • https://rijst.nu/userfiles/file/damekulenibu.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/nuwalokatiximunedan.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210904040017196.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/welorudanuvusovi.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/soboruxabibotetorojimusoz.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/62117778648.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/noxidinanodowis.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/gufofubazevapedoxinige.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/89495528210.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/40007387229.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210921210816.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/kejuzegaxilowitevokolo.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/86267680552.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/xegufepejekote.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/95040351420.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/84577000416.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/buposigakivugitagerop.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/92115602541.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614aca364c5de---duwujapiwawoluwafu.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/zokolitelegitisi.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/puvugevimogumiragir.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614320bacdaf0---97679677823.pdfIn PDF document text
    • https://kerryparsonsfoundation.org/media/file/zamuwudanoluxorubiwor.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/zijawojivojazupoxopinabu.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/41854700846.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_off0000cd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD70 10684 bytes
SHA-256: 91c15d9d79fc62537d7c4eb0123211ef75c3146978d297a33daf3fb9fca59f45
font_01_sfnt_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 17920 bytes
SHA-256: faf66c48f30f786ecee6a572df377ff644aeb55c83dde50c6c6b1814e7ecef6c
font_02_sfnt_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1