Malicious PDF — malware analysis report

Static analysis result for SHA-256 b291fd8e43008786…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 01:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ba54ad509725c89d9208f849f67c359 SHA-1: 9fbc465473bad573aa21458167921dbc56429020 SHA-256: b291fd8e430087865d067aa0a83ab159c934886fee03d8812c00e4d30c9dbd66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. Although no scripts were explicitly extracted, the presence of external URIs and the phishing/trojan classification strongly suggest an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cuacuongiare.vn/upload/files/73432625894.pdf In PDF document text
    • http://improntediteatro.it/userfiles/files/tadaj.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/71393661664.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/zutofebegaxijoxaxozekugo.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/98257186356.pdfIn PDF document text
    • https://beautydent.hu/editor_up/jupunepurelorun.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135acfc523fb---xisaxebederipunuvage.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/24632738972.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/44703821489.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/kezijewutuvojufofisugawa.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/lidatapuka.pdfIn PDF document text
    • https://amgaa.org/temp/files/10676987184.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/57210310168.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/bober.pdfIn PDF document text
    • https://partnermind.cz/images/files/87557095956.pdfIn PDF document text
    • http://drironcat.com/images/file/karenad.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/6752428477.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/15353143633.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/kidumurejudur.pdfIn PDF document text
    • https://fobh.net/userfiles/files/vokefuxukidenisetezaxurum.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/kumogixorig.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/gupepoxudi.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/goxuk.pdfIn PDF document text
    • http://etkenkalip.com/files/gunifevupesosidimod.pdfIn PDF document text
    • https://durimawar.com/contents/files/96746679216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=motogp+download+for+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_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 10452 bytes
SHA-256: 88389df08410e5b65854eea3841475a65e90f63c963eb3c32f7a26f31c80ab64
font_01_sfnt_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 17460 bytes
SHA-256: 093a448709a0ca2531846620ec1d6859615113477ea291f9d732fa61710be733
font_02_sfnt_off0001276b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.