Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a22671f1b79194…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 21:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19296a3a60e106426abbb1955b5fabad SHA-1: 4029272bd516c66d495f929d52c338753cb9badb SHA-256: 98a22671f1b791945e81271c5144beecbf3fb8db9da87f0e876ca32849899e03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many hosted on potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely intended to redirect users to malicious sites or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wirheiraten.de/images/file/41503709584.pdf In PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139b47346540---31136540113.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/16239854840.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3516148519.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/mezulamegum.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/6871540784.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/xenokapojakepewifenuluvip.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/67960678516.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/99733489638.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/97915228970.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/tuzifipuripigomi.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/fuzuragenavoxafid.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/40727045716.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/xetabiku.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/89941876109.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c9ac43071---39792948936.pdfIn PDF document text
    • https://nexapos.com/upload/files/49948857243.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/fevesusuvepowotuxonoku.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/babefasopomulefagawafan.pdfIn PDF document text
    • http://csp.hu/editor_up/ladakadijaxivejiri.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/63538230049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=13377x+proxy+list+2020PDF 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_off0000ceb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C5 17632 bytes
SHA-256: 1e15345361964dfd20cb70df515ac4c1902e21e3a41ea3f3ed1505a44602771e
font_02_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 10484 bytes
SHA-256: 34ca94d7f12b2fd06f584cd9467f872fc83934f43d609035476a825e64e8c520

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