Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9c5ff44ef515bc…

MALICIOUS

PDF

75.3 KB Created: 2021-03-22 17:49:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5269a5463072ab4389039597856aeb67 SHA-1: b16ef220f8a7bb86ee2a3ccb7720433964548b7e SHA-256: ec9c5ff44ef515bc19196a338d9132a1354296e292b2de396a5d76a7a448e6d7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were extracted, the presence of numerous URLs indicates a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/wix?keyword=alien+periodic+table+activity+answer+key
    • http://vofufime.mypressonline.com/infinix_note_5_price_in_india_2019.pdf
    • http://tehnotop.space/daily_planner_template_for_college_studentsf8u8b.pdf
    • http://trynutra.shop/how_to_get_a_curves_workout_at_homeaymae.pdf
    • http://clyb-wylcan3.space/82386106781pltpv.pdf
    • http://rozujed.sportsontheweb.net/thank_you_reply_email_for_appreciation_sample.pdf
    • http://itash.space/355599619572tx9k.pdf
    • http://mivetys.xyz/kotumawomukidabujinhz8sz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://70745723-7f4a-4dc7-98be-95bdce43cd82.filesusr.com/ugd/67bae7_a538f072436a4830a2e47796a7219c0f.pdf?index=true
    • https://b23ebcb4-2e41-4c68-a408-584c84124782.filesusr.com/ugd/5a2446_602bb124b93c433ba2fbaa670368d7c5.pdf?index=true
    • https://s3.amazonaws.com/sifawekujiki/96833247992.pdf
    • https://s3.amazonaws.com/xazarujokemus/samsung_android_mobile_range_3000_to_4000.pdf
    • https://s3.amazonaws.com/satulibaren/platform_bed_with_storage_and_headboard.pdf
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_1c1bee3a3ecf462b860588036b37aeed.pdf?index=true
    • http://katevafitaga.epizy.com/informar_averia_aee.pdf
    • https://s3.amazonaws.com/jasadavebaga/90053965711.pdf
    • http://bokakemipik.epizy.com/himno_nacional_mexicano_letra_original_completo.pdf
    • https://s3.amazonaws.com/zikeko/duzenuvagaxuderubelo.pdf
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_b9b2db6453c241efa4d3043566719867.pdf?index=true
    • http://kiwuvapinemugi.rf.gd/the_formation_of_typical_air_masses.pdf
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_69d84f22539240dab08f355db3fe8835.pdf?index=true
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_38667658a67040de9c410c8303a71c3c.pdf?index=true
    • 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_off0000e75e.bin
ceaa6b7813e037c51e0d3459967338b0996485b767e8b918cc9ab9f5eb84bbb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 5516 bytes
font_01_sfnt_off0000fa3f.bin
09b26d177dd353741d7e5f01413b2bc6ccf344a36be687bb98b35e109885af05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 10500 bytes

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