Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea71a9eab0d8f740…

MALICIOUS

PDF

78.7 KB Created: 2021-09-22 11:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93b776922e061afa33e7bc234dbb5813 SHA-1: 97fa39db44ae10040843f859e47a794477da6679 SHA-256: ea71a9eab0d8f740c88393cb0d3621277c51bf1ca9c8f85f4fec05c84db832d7
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. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable hosting, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links across many domains. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://alarm.pl/userfiles/file/27129295123.pdf In PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/kuloworozuxakizedono.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/41813896799.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/vudewu.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/degativawupudalixu.pdfIn PDF document text
    • https://purefeeling8.com/data/file/xorijilefudufililumu.pdfIn PDF document text
    • http://exosushi.com/uploads/files/baxox.pdfIn PDF document text
    • https://paradigma.bg/uf/file/tipumopiludune.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/74346998888.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/46870160748.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/72829241089.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/22643472747.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/namasomog.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/vutotasasilukeluk.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/13017894224.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/wekes.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/mibeletokuzilufimemokilan.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/jojirodix.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/dazidagugijazixuxugivage.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/mavopefotelilimu.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/12116703114.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/43951261994.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/gufazirix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=friv+www+com+2017PDF 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_off0000d0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 10156 bytes
SHA-256: 3028feff6a97a7da80004110840ae16cf913628855d07e46313e6c681bce8b35
font_01_sfnt_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 17888 bytes
SHA-256: 04b185e4695ae59f7b9f18c2a7818491a9269be29e0eacc418f50f509cc9e9b0
font_02_sfnt_off00011575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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