Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d4b40890bbb8a6…

MALICIOUS

PDF

75.1 KB Created: 2021-03-09 02:00:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 608600d8081a4f479770d110871e70bf SHA-1: 253dd79bdd6912f95c2ca852635338e066aad303 SHA-256: e2d4b40890bbb8a62823094eab46e0f3d49008a86f7c9a38b880655d9308896c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting, specifically pointing to 'http://chatik85939775.fun/6990161463p25z3.pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://bologen.ru/123?utm_term=arduino+uno+usb+driver PDF link annotation
    • http://chatik85939775.fun/6990161463p25z3.pdfIn PDF document text
    • https://cdn.sqhk.co/kutogudofi/Ubhfggg/53410791816.pdfIn PDF document text
    • http://evilcheats.fun/weather_live_stream_hurricaneufvmz.pdfIn PDF document text
    • https://cdn.sqhk.co/rexazileka/egjgche/50943877173.pdfIn PDF document text
    • http://byt-upak.ru/92093709715s5g76.pdfIn PDF document text
    • http://idealica-it.website/samsung_galaxy_s5_active_clear_casestuecn.pdfIn PDF document text
    • http://teenagetutor.online/chloride_spegel_battery_charger_manualkfgzp.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/ii5LWAH/30404671439.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_4896d3c197aa4e11bd33b59dff4cda10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiduro/cgp_an_inspector_calls_workbook.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_e38ee0901b63402f8074b8366193457c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/rosemount_3051_manual_fieldbus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb58904-fa4c-4fad-9991-2a7b240667a4/21144915035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b88caa-702a-41f3-8236-f485f3a49516/piziwabejesenezowomifajo.pdfIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_0a2ac270f4ef4303aff3a31e9c947a5c.pdf?index=trueIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_6b4766e2ac8045e183e284e51fba87fd.pdf?index=trueIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_1578a77c29d3441cbf18d8badf72d92a.pdf?index=trueIn PDF document text
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_a805b2c3d51f4e999a3bf37e7cf35601.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4be3666-9202-40d2-bef6-defeba8eb180/66511761630.pdfIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_1df0cecaef2d4ba9abf1d63c03f7c117.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_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 4764 bytes
SHA-256: 9a672d198caa5f013e43e5bf8a26671a082e7b471bebb46cecde035846cb49a8
font_01_sfnt_off0000fb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB68 10612 bytes
SHA-256: ed972f5b347700d29dbeeb221cd01fcf5638eb55a434c14494696619025d82ca

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