Malicious PDF — malware analysis report

Static analysis result for SHA-256 314e6f47d644c19d…

MALICIOUS

PDF

81.7 KB Created: 2021-05-09 12:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 14d0de9ca372c21bb9068f9a05363161 SHA-1: 4fa37976025cd7e8d570cd18a6dd7100fe95da86 SHA-256: 314e6f47d644c19d9e4203ebfc4fd3937fcd0f40dcbecdf1d4e1e653c448d5c5
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, many of which point to other PDF files, suggesting a link farm or SEO spamming operation. One of the primary URLs extracted, 'https://soxebez.ru/strik?utm_term=what+is+pr+marketing+communication', is likely part of this scheme to drive traffic. The ClamAV detection and ML classifier also indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://soxebez.ru/strik?utm_term=what+is+pr+marketing+communication PDF link annotation
    • https://cdn.sqhk.co/dopinaku/iKnSjeK/18139588778.pdfIn PDF document text
    • https://cdn.sqhk.co/tefaxobaf/aULJiju/95016813580.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/YHYhcUl/76678856343.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/SihEjbB/banner_saga_2_character_stats.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/ijhihbY/72721699173.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_645dfac8e8f946c5ad9408acfce77e0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanubili/zobatinifekagatulijowovi.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/zorufewutomalaje.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/is_physics_a_good_job.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/99592074976.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/rebipazeme.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/descriptive_writing_questions_igcse.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/autumn_ppt_templates_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41d2513-b9d9-4f19-b01e-c7a8a5540126/how_to_purchase_stocks_in_singapore.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/limigoxusutejifog.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/sex_offender_registry_laws_in_north_carolina.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/competency_based_interview_questions_and_how_to_answer_them.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f57bdb5a-d3a2-41ad-9af9-c9205c1aae70/rawetugize.pdfIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_1ad3ca98be564dbaa430d6f4de773767.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_off00010104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10104 5392 bytes
SHA-256: cec7e2d58b9fddb44b2b1597031a4d945353def8cb11f901b9853a1abc148e91
font_01_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 10640 bytes
SHA-256: f1f113f52c859a17902bc3288f3be08103cf946a85c0941e42f7f38db177976d

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