Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b82bbb359c60b9…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 12:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87289705c11aa8da1e017885de158219 SHA-1: af440c085531661f9db7c0cc8fab8b63d641b074 SHA-256: e2b82bbb359c60b9c25c6ee166f0558db7ed63ac833f97cf11d73e348fd504e7
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, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://thecuriosityshot.com/jidof.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/82b71i0qsspa1vtrks5ot2ac9b/zudinesosixezas.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/17/file/20210917_102457_199.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/pedugirimexisakipu.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/puzaxofadoxa.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/53011288683.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613667d00a9fd---remubedixaninisimip.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/sanofotiluposipadad.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/begosutigog.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/wopaliloju.pdfIn PDF document text
    • http://zuszdounky.cz/files/farexibap.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/40645385436.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/xadepalixawep.pdfIn PDF document text
    • https://drlanda.hu/user/file/fitekuwowudimigarok.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/muxixozemijak.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/67079045985.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/76944139982.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/nobijug.pdfIn PDF document text
    • http://hijoin.hu/editor_up/56693523648.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/lizofaruduz.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/25748511630.pdfIn PDF document text
    • https://hotelcorona.ro/files/31673415968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=magisk+for+pcPDF 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_off0000d104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 18104 bytes
SHA-256: a7f6d04861f8eb4ab783208bba47b3b8ae9b3921eafe95c68bcd2408cf5378b8
font_01_sfnt_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AF 10360 bytes
SHA-256: 9d8733761f4f9f1a9a7511f2846d182f86ec00eeaee0c8c0059a3321a1982420

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