Malicious PDF — malware analysis report

Static analysis result for SHA-256 6928bf24f8a654a8…

MALICIOUS

PDF

80.3 KB Created: 2021-09-10 09:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b599d6f5ee4714c634ce46c70d721d52 SHA-1: 54c92cd0b2066b7198683c19c551f4c2b0a966a2 SHA-256: 6928bf24f8a654a848b9f79d02cac16c00ee303b661b3a530aef4a11e9db9a6f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a potential phishing or spam campaign. While no scripts were explicitly extracted, the nature of PDF malware often involves exploiting vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://philabc.ru/uplcv?utm_term=how+to+cast+mobile+screen+on+laptop+using+usb PDF link annotation
    • https://newsru.md/upload/userfiles/files/betijesetuvalutirota.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/66027168347.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/wukobosolobufonuju.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/55329680496.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/dedidagup.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/39468497738.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/dijewijanovekumulefarutut.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/11458868325.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/kazipurumivovi.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/44006951277.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/17701212058.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/1276636820.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/45341973750.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132cd8c872d3---64506556385.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/letegasesokexur.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091003214797817.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/84708926852.pdfIn PDF document text
    • http://104408017.linker.tw/files/loxodunepogus.pdfIn PDF document text
    • http://poultech.net/d/files/dotez.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/filog.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/zukun.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/e8500895fac5392d6ae0bc04350a2399/fenobalobedovikezelu.pdfIn PDF document text
    • 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_off0000d361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD361 11032 bytes
SHA-256: 83b51bc74d8de3296e3d0a3f8450ca595df79863b3eac9f085b7cb00b50132ab
font_01_sfnt_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 17804 bytes
SHA-256: b1435d8d2de148828788bc71bd72bee6d40f4a57c59fabaad6ff849413dca850
font_02_sfnt_off00011b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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