Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea4a2be691cfbb0…

MALICIOUS

PDF

77.3 KB Created: 2021-04-28 20:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 68919468fe62db34e415a921bf6864a4 SHA-1: fdc32754db58ea48a3ebf7794e46cdc05a8ae48f SHA-256: bea4a2be691cfbb0bc8abd7e3a186f0e597d4c56fa649ff0484d660813d20e81
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a phishing lure or download a second-stage payload. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution 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://seumenha.ru/strik?utm_term=brookstone+wireless+speaker+instructions PDF link annotation
    • https://cdn.sqhk.co/xavaxonad/AiguAhj/warframe_helminth_abilities.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/7euNsjf/afk_arena_realm_of_denial_lost_prophecy.pdfIn PDF document text
    • https://soxexovefulobi.weebly.com/uploads/1/3/1/4/131484328/ca824002a1d.pdfIn PDF document text
    • https://melesanej.weebly.com/uploads/1/3/1/1/131163783/tepudulazed.pdfIn PDF document text
    • https://pujezifug.weebly.com/uploads/1/3/0/7/130738771/188368886e7a.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/buK7ihc/13263404801.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/ejibrhj/this_war_of_mine_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/gLd1iip/4479162533.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://toxukofotu.rf.gd/free_download_convert_to_word_for_android.pdfIn PDF document text
    • http://xojabujujipeze.rf.gd/bowosim.pdfIn PDF document text
    • https://f0f855fd-29d2-4bf6-9fdd-af1de8d1f91d.filesusr.com/ugd/184831_af680c65a91a4d99a7af0f4ce20d13c4.pdf?index=trueIn PDF document text
    • http://rinonefor.rf.gd/66229976974.pdfIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_9917d558887b4fd0aebb9f20c3326c93.pdf?index=trueIn PDF document text
    • http://kuwoguki.epizy.com/71551698544.pdfIn PDF document text
    • http://mosuzuxogobet.epizy.com/narasimha_karumanchi_data_structures_in_java_free_download.pdfIn PDF document text
    • http://nibudomatimemi.rf.gd/jazz_guitar_arpeggio_exercises.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_219de7dc92234e509cddcb586ab5b840.pdf?index=trueIn PDF document text
    • http://mujujum.epizy.com/amliorer_sa_confiance_en_soi.pdfIn PDF document text
    • http://jisaxabajerofu.epizy.com/zununeworuz.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_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 5132 bytes
SHA-256: 44161f25c3ec9cb2efd847b73e88654185543cb891c201c4a77a7bb72d5fa655
font_01_sfnt_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 12404 bytes
SHA-256: 8d22f3e06684ada638aa24411078d2fe61d08efe64f562e793ea823e53e97219

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