Malicious PDF — malware analysis report

Static analysis result for SHA-256 9807f882c18ae055…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 22:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9bfc652d9e2957f88e3dc7878fe50a4 SHA-1: 4b5d0ef177a63448c89e0179e46e7a1f0800e48d SHA-256: 9807f882c18ae0550aca6ce4d10607621433c9b86a69e2c489eeedd9abae2b04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving user redirection.

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 http://grupopiscis.com/upload/files/logaretoparijewemakik.pdf In PDF document text
    • https://rkdestate.com/userfiles/file/xovos.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210923194637.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/duxesawefezotutawuw.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/tufononuwa.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/38096225465.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210912081527.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/34987354255.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/40847219960.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/kifonozijugufiraliluwejok.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/38756963397.pdfIn PDF document text
    • http://handgun.ee/media/file/didonolofezugopisugoji.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/29159503498.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/7335528631.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/16088545976.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/vubiripetag.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/89896564721.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/zujonuzixujak.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/95019735428.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bb337e85abc5aa0340f78e9f32a82778/69909672385.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/80253253411.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/napetoz.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210923_49351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=3bhk+house+plan+ground+floor+3dPDF 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_off0000ace8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FA 16228 bytes
SHA-256: 4d1570d804953dd89ae180e6f6724107f25c897833b4a76a20a54a94288a9f94
font_02_sfnt_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 10996 bytes
SHA-256: 9eb64d683db7aad5482e4857cc3890174c9b304ffc6e255311e70b2fe1b9234f

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