Malicious PDF — malware analysis report

Static analysis result for SHA-256 e851a59951d2fe09…

MALICIOUS

PDF

84.2 KB Created: 2021-03-29 17:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e770e60d6c91bdbcfd0cad9fd46700ad SHA-1: 445f880a3cb97ab015e9c0a7bdb6c920c536a7a2 SHA-256: e851a59951d2fe09ef7777cb3bb208c78e115038f2cabbfee9cd9a1a652a5b89
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing or trojan PDF. While no scripts were directly extracted, the presence of embedded URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is designed to redirect users to potentially harmful sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://baarspo.ru/award?keyword=building+construction+agreement+format+in+english+pdf PDF link annotation
    • https://dexazime.weebly.com/uploads/1/3/1/4/131437554/duligegut-faxipobobopire.pdfIn PDF document text
    • http://hocostyle.ru/best_pandas_tutorial_youtuberyb8w.pdfIn PDF document text
    • https://zodoxofavuzawa.weebly.com/uploads/1/3/1/4/131437464/gibaxixolemejuli.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/xakuveradevusor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496005/normal_604a329b5e519.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/rirubozumolepatelugexq5eee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_604ab3cc09099.pdfIn PDF document text
    • http://autobuff.xyz/how_big_is_the_starbucks_logo_on_reusable_cup3t0c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459645/normal_601f9d4d553c4.pdfIn PDF document text
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/wufajenagigubusifi.pdfIn PDF document text
    • https://neseroto.weebly.com/uploads/1/3/5/3/135326238/876931.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_7e61761462f941bfb2e7cb3b25085029.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17704d84-fb43-4aa0-ba3e-e1cbb1823d52/ligeselezisezadewi.pdfIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_fbc05c30f018407bb2c672c2ec754726.pdf?index=trueIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_77bfeaf22ab543ca98d5134138ba771d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/294d1c5a-0eb3-4e59-a054-69f3e37580d1/how_to_reset_midland_walkie_talkie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17f4838-6fbe-4893-8f6f-9ec7ebb5a0ca/90778353322.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 5616 bytes
SHA-256: 48e58c03de8064a1ef6d51d3697e4bc4ff455fd1d2b370bef0b77ae97745f3ed
font_01_sfnt_off00011d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 11028 bytes
SHA-256: c031b99fd6a6d195bfe4cef5942f7be4b4d8032ebf33a9a62b4b25b8189ba464

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