Malicious PDF — malware analysis report

Static analysis result for SHA-256 8667c8e8b9b541d0…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 13:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1b847201c2ecbd7771eafb8ec7711f64 SHA-1: 65c8a1bac2026ff5259c513ee35f6300e94028d3 SHA-256: 8667c8e8b9b541d0646f68171d33fcbbceec0876a65b21f47818fa27865d5315
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics identified it as a link farm with numerous external URIs, many hosted on potentially disposable domains, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://impactpluslearning.com/ckfinder/userfiles/files/dowoza.pdf In PDF document text
    • https://veaodaibrahma.com/uploads/image/files/6410972960.pdfIn PDF document text
    • https://zzhqhi.com/d/files/bivujuzeripenedibo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad21363cf4---japisaji.pdfIn PDF document text
    • http://exosushi.com/uploads/files/todes.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/fikikowoxumurikarag.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/51023039810.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/4827101869.pdfIn PDF document text
    • http://cartopack.com/Images/file/57876356457.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/ledufemorini.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/50616305918.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/defuxovelisifubuwini.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/68261492812.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/zodijuzak.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/27089427305.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/32483112015.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/paseriwuvotogusufabosawax.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/87429102337.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/52826432147.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/bf944da3b7f6776f898b50fbec6637d7/77771117823.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/66945369014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=garena+free+fire+ppsspp+downloadPDF 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_off0000adc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DB 14652 bytes
SHA-256: 305d527e33e3044f8375a12a9e19f7165559c7c35a912425bec370728f35c92b
font_02_sfnt_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 10516 bytes
SHA-256: 6868e2ead06d78722bce76a6daf56d340eee7e1b594ff30103919b953bf14aa2

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