Malicious PDF — malware analysis report

Static analysis result for SHA-256 1672be5c0c7cf9d7…

MALICIOUS

PDF

75.5 KB Created: 2021-09-21 02:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2127278be3df89aaadd532cca5677ad SHA-1: 94d8a6502ff6e4b04dd5c88d02d22937dd08f880 SHA-256: 1672be5c0c7cf9d7311fb3dcf232f7c3c56a4bf9ae3918a55c189c6881c9c474
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://tiemhoahaibara.com/data/dulieu/files/xokepadifudinagokemes.pdf In PDF document text
    • http://metall-press.ru/files/6105707622.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109110201414406.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/wetabobefo.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/53060772550.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/58237444721.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///62408938159.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/jipub.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/fuvosuvurirebojinikax.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/povip.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/midulogovowik.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/58632761845.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/lefog.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612efdb4db201---vixeka.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/98916829526.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/46671097907.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/vomebuvenusulopo.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/73223076216.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/nudixutumugaguzibawasazaz.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/dazizoj.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/pivumorosejerekopi.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109112323201786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=completing+the+square+calculusPDF 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_off0000c1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 11096 bytes
SHA-256: 3ec7c80b76374de48321501b927ba076f1a8ac3ce695fa91f5b465b0f538dec6
font_02_sfnt_off0000f31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 17440 bytes
SHA-256: 04d78be4b117447e66e485406e50006b054a4ee5057537f24cd136f23155a5c4

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