Malicious PDF — malware analysis report

Static analysis result for SHA-256 8726af89b7c1418d…

MALICIOUS

PDF

68.3 KB Created: 2021-09-19 13:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2dfd9427eef52817c497401a99464f74 SHA-1: 30b407421358686940afa521e1234a1c7ae1382e SHA-256: 8726af89b7c1418d3ce8a9ccc781059ca703eb747f1bef74493f08af61942326
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. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of malicious activity, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sbstroy53.ru/img/files/kolotafezubibemu.pdf In PDF document text
    • https://dlt-nkp.com/fileupload/file/kitorexuduripufidoj.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/89397592722.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/78884840150.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/nibiporo.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/72479570489.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613227a4b7aa1---lewokimuwetijakedotu.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/nujudabukosazirosivomoxom.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/5237336972.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b62716e169---10305832784.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/difudopujekitofovoj.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/nubugux.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/49989364615.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/46789211106.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/67219021992.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/56125903007.pdfIn PDF document text
    • http://njchemland.com/upload/files/51911043400.pdfIn PDF document text
    • https://magatek.com/documents/file/36857526669.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/fevusino.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/27907509830.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/53207102771.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/72258194672.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/kezofafutikuz.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/lijopamigesozilezut.pdfIn PDF document text
    • https://kawanmto.org/contents/files/zediwom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+open+iphone+11PDF 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_off0000b04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04E 14880 bytes
SHA-256: 9f85a35b16c408800597510cf83d55ab7db168b81bbbc995259a07796ec02a26
font_01_sfnt_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 10004 bytes
SHA-256: 9debd7df3c9b126772cfac9f1687dcde931fcfdd18ed4b76391164e5d2d3bee0