Malicious PDF — malware analysis report

Static analysis result for SHA-256 795e4eaf63af505c…

MALICIOUS

PDF

74.1 KB Created: 2021-03-14 03:29:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 6797acc1dcf0c9152359a7f43e2d5187 SHA-1: 77713c346b60042820b9d09b0e9f6c1534105ac1 SHA-256: 795e4eaf63af505cc68038358edc26fb90c3e13e8628103a902135ba15b73a21
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://ponafet.ru/wix?keyword=kingdon+agendas+alternatives+and+public+policies+pdf PDF link annotation
    • http://morasuxod.getenjoyment.net/93851758173.pdfIn PDF document text
    • http://cmbespaceclient.xyz/how_to_learn_pythonl29n5.pdfIn PDF document text
    • http://sait-ok.ru/volume_of_prisms_worksheet7uano.pdfIn PDF document text
    • http://vovality.club/capitulo_4a-_4_asking_questions_contoxonv.pdfIn PDF document text
    • https://jobeluke.weebly.com/uploads/1/3/5/3/135318189/a31ebf4af9bf.pdfIn PDF document text
    • http://stopro.store/reveries_of_a_solitary_walkervs855.pdfIn PDF document text
    • https://nibevomixosu.weebly.com/uploads/1/3/4/1/134108547/gotetifenegof.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/big_star_pop_quilt_pattern.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_86db35eb74684f7691df998fed1fc142.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_edd76c65435e4e8da6a3a72d28b6ed01.pdf?index=trueIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_2d98ca8fe7744292bb9e6f731e22dfb0.pdf?index=trueIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_cf435cb840334679ac3a6fe68c9119da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/incident_reporting_template_free.pdfIn PDF document text
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_e7dd30001be04a4d9a7fa53251c63022.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/best_volume_booster_app.pdfIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_df724a0b26af4e86939cb7a63335ca44.pdf?index=trueIn 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_off0000e34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 5492 bytes
SHA-256: 1573dab86c1f8d289cd11fb66a413e98c93949879f9e04a5cbe018e537c07de9
font_01_sfnt_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 11128 bytes
SHA-256: cd6f94e946752e82aed66b7b09f95a4a6265412886bb7249e345663ea2c43225

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