Malicious PDF — malware analysis report

Static analysis result for SHA-256 8028c4c92573f43a…

MALICIOUS

PDF

78.1 KB Created: 2021-09-14 13:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 972f61ba5de40954a0e631d85b6cc4eb SHA-1: 9ede0fcb1c7be5c782745fbcaef89998256238ad SHA-256: 8028c4c92573f43a348033f780aa17ee33fa2c48a1c903a9d1ae587cd9ac20ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified 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 potentially disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF format itself often implies JavaScript execution for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lenosada.sk/editor_uploads/files/80305771311.pdf In PDF document text
    • http://eska-lift.ru/userfiles/file/16481209042.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/26782052988.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/julebajamoj.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210914_101402_141.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/73375655649.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/zijizawidalufonepozufu.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/cadfe15282bcadc78f09485a0421ffb3/dukerovivexur.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/75474527130.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/82268595536.pdfIn PDF document text
    • http://runhouchem.com/upload/files/86242733244.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/dewejugolenasawi.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/66004976663.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/wikenawimi.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/xumarokijanewi.pdfIn PDF document text
    • https://suruburi.net/mm/file/giviwasebovavudunoki.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210904054725.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/16837876569.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/11114809771.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/tuwisodirof.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/dakupanewoninopaw.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/81815121011.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afbc3f0463---dolupadexufo.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/79112529808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ppsspp+files+to+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_off0000ce6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6A 10476 bytes
SHA-256: 304afe938d8d3075878b64ceb49248a821555d837949ce235388580149612c2c
font_01_sfnt_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 17332 bytes
SHA-256: 193e2f32b0f7978ead17be8b6683bd40073d2000c0da81c41615cddcaacb5e6c

Open this report in the interactive analyzer, or submit your own file for analysis.