Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4b2d8bef509ce2…

MALICIOUS

PDF

78.6 KB Created: 2021-04-19 10:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4def103ad66e296b28cc7ddefb026011 SHA-1: 2efe6b6b7fd7e7aa085703dfbb13218626f9ec4b SHA-256: 3a4b2d8bef509ce27a0b69c39826a1b3c89a7992b6091948a62e369c10305410
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were extracted, the document's structure and embedded links are designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=best+4+station+sprinkler+timer In PDF document text
    • https://cdn.sqhk.co/fomiroza/hif656S/jugojuxuzujositexugeraxu.pdfIn PDF document text
    • http://kevarusakoko.mypressonline.com/logical_functions_in_excel.pdfIn PDF document text
    • http://rowajenuw.iblogger.org/utility_bill_template_word.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/68605806410.pdfIn PDF document text
    • https://cdn.sqhk.co/zomulusiku/bgc6iiE/compound_words_worksheet_esl.pdfIn PDF document text
    • https://cdn.sqhk.co/lutuganoda/dw82Ajd/52264782429.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/hbhj4m5/favouring_or_favoring.pdfIn PDF document text
    • http://mozovurezet.iblogger.org/causes_of_depression_journal.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/6ThjMmu/balloon_slingshot_for_sale_nj.pdfIn PDF document text
    • http://tufokazavet.iblogger.org/retorika_book.pdfIn PDF document text
    • http://noxerazomefo.iblogger.org/86302778901.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/algebra_2_diagnostic_test.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vivetusukuv.onlinewebshop.net/posuwodikesibaj.pdfIn PDF document text
    • http://wegadikas.epizy.com/82920412730.pdfIn PDF document text
    • https://4407eba0-147d-4e9d-98ff-19010b67f466.filesusr.com/ugd/c1f2fd_68000f55b96f485680ea09884a78ef22.pdf?index=trueIn PDF document text
    • http://lelisavebak.rf.gd/89804432576.pdfIn PDF document text
    • http://tidizovebimike.epizy.com/64806826466.pdfIn PDF document text
    • http://zuwasezubolek.rf.gd/58724472906.pdfIn PDF document text
    • http://kunilanudatido.epizy.com/69976459049.pdfIn PDF document text
    • http://zikajubagunefef.rf.gd/brandenburg_concerto_2.pdfIn PDF document text
    • http://madukavinoxonal.epizy.com/fawejanitudinama.pdfIn PDF document text
    • http://megozesupulop.rf.gd/girl_scout_cadette_uniform.pdfIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_a40f1aaea43045f886d80008f98b70e0.pdf?index=trueIn PDF document text
    • http://gexitake.epizy.com/adobe_premiere_elements_trial.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_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 5168 bytes
SHA-256: 7d3260d57cb7262c772e03741a43fcb143890490552c298bc3df56602239fa88
font_01_sfnt_off000107cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 10904 bytes
SHA-256: f5f4edd7e6a8faa566359467eea1baf70913246b0525729365edcbe6811aaf29

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