Malicious PDF — malware analysis report

Static analysis result for SHA-256 811859f7f9f4422d…

MALICIOUS

PDF

93.7 KB Created: 2021-03-23 16:21:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a10dace395da79ea79970eee6ad06eba SHA-1: 21ef3b92e8f38b2d35607cc0ef24ebd86a20a1c7 SHA-256: 811859f7f9f4422d5f3edd2bac22fb6cc4f2479959e1d2b6362df35388b9e28b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to lead the user to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/123?utm_term=cross+laminated+timber+sheets
    • https://nubazodakop.weebly.com/uploads/1/3/4/8/134850303/bebirezepekara.pdf
    • https://cdn-cms.f-static.net/uploads/4470692/normal_6025211b57587.pdf
    • http://cenderaoriginator.com/538271769334iqrn.pdf
    • https://static.s123-cdn-static.com/uploads/4402737/normal_5fcdde5ac8fa9.pdf
    • https://bopidojosonek.weebly.com/uploads/1/3/1/3/131384153/gufunaw.pdf
    • https://static.s123-cdn-static.com/uploads/4489853/normal_5fc62b89977e0.pdf
    • https://pefojefevofat.weebly.com/uploads/1/3/4/6/134659321/niburaxosewu_sirapif.pdf
    • http://iminn.ru/adding_and_subtracting_rational_expressions_worksheet_precalculusn7n0v.pdf
    • https://cdn-cms.f-static.net/uploads/4501791/normal_601e711a7177f.pdf
    • https://cdn-cms.f-static.net/uploads/4488349/normal_6050f0a0bf051.pdf
    • https://cdn-cms.f-static.net/uploads/4448345/normal_601ed388b72cb.pdf
    • https://static.s123-cdn-static.com/uploads/4459464/normal_60068e54905f2.pdf
    • https://static.s123-cdn-static.com/uploads/4452608/normal_5ffbe1f9da356.pdf
    • https://static.s123-cdn-static.com/uploads/4381735/normal_5ffcc38104068.pdf
    • http://mybiol.site/14998590983ai3fx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4c4ce676-b6ff-4e51-bcc4-dedf89b313ca/top_secret_recipes_free.pdf
    • https://uploads.strikinglycdn.com/files/ea2e1796-b259-4dd2-974b-ab8123d8d33c/ligowuragilozu.pdf
    • https://uploads.strikinglycdn.com/files/677cd1d0-4bd0-4c17-b760-0a96cf558601/78827738151.pdf
    • https://uploads.strikinglycdn.com/files/d5d255e2-d194-407e-8bb4-ab70897ddf4d/how_to_tell_if_my_anker_is_charging.pdf
    • https://uploads.strikinglycdn.com/files/ba69ffe3-83a5-43af-8f10-b6ddacb864a2/giwojotofepusa.pdf
    • https://uploads.strikinglycdn.com/files/faf23616-d11a-4985-bcf7-74114d98bb34/73826137974.pdf
    • https://uploads.strikinglycdn.com/files/6edc3792-8a94-44ff-b17d-b117d12db0dc/72469174104.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001325e.bin
528afb2c4c88409f4ae1bdbc2785c108600fefe826948f9025445899cf32f2e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1325E 5108 bytes
font_01_sfnt_off00014381.bin
bd54235350e9cbb93babfd90bf590e017d31a65b575160b713f389738847c154		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14381 11256 bytes

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