Malicious PDF — malware analysis report

Static analysis result for SHA-256 beddaae1eda15734…

MALICIOUS

PDF

68.0 KB Created: 2021-04-05 16:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 049323bc987380a3f1164f3a668cd70d SHA-1: f9a6dfd3ab339d31110bf79f0fe97465664d7982 SHA-256: beddaae1eda15734d64ec211bf3f523051225ec9b829ba78bad97256279e53cf
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://resalured.ru/award?keyword=libro+basta+de+historias+andres+oppenheimer+pdf PDF link annotation
    • http://playmarket-online.com/bezezua4982.pdfIn PDF document text
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/61f6d99da.pdfIn PDF document text
    • http://scandisvet.ru/90848688594uir6.pdfIn PDF document text
    • https://jodaxirijiv.weebly.com/uploads/1/3/0/7/130776114/mefujazego.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/6ighagj/luxuziw.pdfIn PDF document text
    • https://bagawilikazukir.weebly.com/uploads/1/3/1/0/131070307/murabojijigorap.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/mjgjfic/gababepejizasunir.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/y6qajjx/21058418107.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e86935-4d64-446b-a064-2854a720526f/what_is_statistical_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e94afd8d-37f2-4003-a96a-718519214764/a_levels_chemistry_syllabus_2021.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_143defa1c4724d4c9aa54ed280ace3b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/937cc796-8392-4a90-897f-9d6734537e83/singer_4423_vs_4432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5dd434e-ec34-41eb-b0dd-e1755d5a54d5/what_is_the_easiest_forex_strategy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea1e77b-dd2a-4d2d-85ec-1c08fd401b17/rikki_tikki_tavi_movie_dvd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7334e5a5-49fb-48b3-9243-68f363383a4c/how_to_be_mechanical_design_engineer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8b72cb-d468-4319-b648-85f9fd83ce64/hatchet_book_online.pdfIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_53b9dc1a3de442eaa89adae23dd5c4a0.pdf?index=trueIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_c9fd86ea94184ff78d971bf5bd76669a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b481b19-1e65-4bdc-88f2-5551b9bd07cd/mesitaserasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be0f011-a85f-450f-9018-d394ecf5a6d9/american_red_cross_donor_id_number.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_off0000cd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD70 5328 bytes
SHA-256: 2fa6faf47c5efbf021a7989c422a7b362309bf929f4c8ca3db3b5577cdd329e6
font_01_sfnt_off0000df5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 10728 bytes
SHA-256: ad66f14fd70024bc4382218ce1f1d2da21d302490f6579fad33eaee813d63b87