Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a7816160296caa…

MALICIOUS

PDF

71.0 KB Created: 2021-04-02 22:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6c8a0082c1a8ec00cf926fba37723f59 SHA-1: 934e8fa446062eed9841f8c82b36375a1b9e63c2 SHA-256: b9a7816160296caac03ae03581ea9e1dfc2ce54c4268fda0a34afe8168f34d12
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as an external URI pointing to a suspicious domain ('pelibifir.ru'). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further suggesting malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a phishing or malware distribution role. No scripts were extracted, but the overall structure and URL findings point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/award?keyword=cambridge+primary+science+activity+book+6+answers+pdf PDF link annotation
    • http://sujifanuv.22web.org/latex_fancybox.pdfIn PDF document text
    • https://wojizenufojanog.weebly.com/uploads/1/3/4/7/134724603/wujelapikebebip.pdfIn PDF document text
    • http://zajiledafalam.getenjoyment.net/5557912929.pdfIn PDF document text
    • http://idealica-ordina.site/examen_comipems_2018_simuladorpvrsq.pdfIn PDF document text
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/8386fe.pdfIn PDF document text
    • http://theporte.xyz/muladwtg8a.pdfIn PDF document text
    • http://xanusojuruxu.sportsontheweb.net/message_broker_tutorial.pdfIn PDF document text
    • http://reduslimitalia-official.site/jeevan_amar_855_proposal_formlof7e.pdfIn PDF document text
    • http://nilanudid.iblogger.org/31290926829.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/1c5361ad-85b0-4d18-86f6-4a3ee5229394/81464973307.pdfIn PDF document text
    • http://lebofimuvi.rf.gd/does_teresa_die_in_the_death_cure_book.pdfIn PDF document text
    • http://poravilotizeve.epizy.com/precision_sheet_metal_works_bangalore.pdfIn PDF document text
    • http://gorijazesi.epizy.com/krups_il_primo_espresso_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c515bec-5b2d-4a42-acb9-092a7a5120fb/2005_cadillac_cts_ls_swap.pdfIn PDF document text
    • http://dudakitulefuteg.rf.gd/lekagekoxawodixowunis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b97984-acb3-4488-a559-ffae10b28926/54692614288.pdfIn PDF document text
    • http://naxilolebepup.epizy.com/vicks_invisible_mist_humidifier_how_to_use.pdfIn PDF document text
    • http://jigiwema.epizy.com/html_tags.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d64cc76d-d6fb-4bab-918c-7579e837db41/mavesawarebunugirukunawaw.pdfIn PDF document text
    • http://dexifenila.rf.gd/buddhist_calendar_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b0f63eb-3365-459f-af51-953861d9b770/53071143582.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_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 5960 bytes
SHA-256: 6c74b6310b0523dfa5ab2c051ae58923642ce97507bbad0663f50077b5f2375e
font_01_sfnt_off0000eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 10116 bytes
SHA-256: 3bde84e9f6eddb56c852129e46ce9cd317a639ced096a9e6b363c891f7aee6bc

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