Malicious PDF — malware analysis report

Static analysis result for SHA-256 83275865aea1ee2c…

MALICIOUS

PDF

76.9 KB Created: 2021-03-14 21:32:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0101e07e749c6aeea7f0e04e3788c92b SHA-1: dcdc0941ac6ef9f3e1f3edada2e0ae05f65815b1 SHA-256: 83275865aea1ee2cc3c318646d6fc1944c02dc0b6bc88afac648ea68150b7e68
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://mezovuduw.ru/123?utm_term=balance+sheet+excel+format+software PDF link annotation
    • http://gixipures.sportsontheweb.net/2199134920.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/4013650.pdfIn PDF document text
    • http://pexarinolal.mypressonline.com/data_analytics_beginners_guide.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/how_do_i_log_into_my_cloud_key.pdfIn PDF document text
    • https://dowusezawidi.weebly.com/uploads/1/3/3/9/133997386/1517283.pdfIn PDF document text
    • https://cdn.sqhk.co/jawefujivi/fhcgfqs/5216928111.pdfIn PDF document text
    • https://nifazupu.weebly.com/uploads/1/3/4/5/134507595/5245350.pdfIn PDF document text
    • https://cdn.sqhk.co/rurizibaxami/XfLjhz0/11253534810.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/2286765692.pdfIn PDF document text
    • https://bejitukinerebi.weebly.com/uploads/1/3/4/8/134890105/9086369.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/hiGgejj/people_are_awesome_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/0MjjE4k/laxeze.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/2ac434f7-bd72-4b17-bd2b-c13746edae07/zekenisujubuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed569d7-3f27-40ad-a34f-24f5dea6509a/zivusog.pdfIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_fdf7ff4293d146f4a9f0d9d6ce9ba9dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pujinit/kuloveguxes.pdfIn PDF document text
    • http://zijedan.atwebpages.com/70611814073.pdfIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_bb3f6ac0e09446dc8e1d82030f4ac0cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/94e74ec2-6e18-4241-95b7-eaff202514d2/42978990561.pdfIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_91983b6838fd4d739c4aa240a7733134.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_becdf3ada65246c284094cd6fe7bc5f5.pdf?index=trueIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_187b7ab6f35f405182f9aedbd5699f6d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2961e3ba-df03-4b9c-b369-39bdc9f9506d/2012_jeep_grand_cherokee_overland_v8_gas_mileage.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/transformers_g1_arcee_first_appearance.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/93001579017.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/aadhar_payment_app_for_pc.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_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 5332 bytes
SHA-256: 089da955ae358da53b9d0fc1987104a8a3a575f73dd8f81ba632e89110c47221
font_01_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 10296 bytes
SHA-256: b95bf8a0edf16bfa0aaa241838b33d086463a8a2644b7fefc0ff1e0720654243