Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6c4b76dd165fc4…

MALICIOUS

PDF

86.8 KB Created: 2021-03-30 21:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a2986bfa4cdf5de4d09a454a5c5c4b3a SHA-1: 7e18a5de59f0d48d917e3de796f93cac1e81afe8 SHA-256: ab6c4b76dd165fc4d025971e2c45df06125f65e4831d2ba4597281c16611b020
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The primary malicious URL identified is https://vilenefex.ru/strik?utm_term=does+diono+radian+rxt+convert+to+booster, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=does+diono+radian+rxt+convert+to+booster PDF link annotation
    • https://xunujilitaga.weebly.com/uploads/1/3/5/3/135315779/vogapelafunaw_xodubugu_tikeledu.pdfIn PDF document text
    • https://segoponozumi.weebly.com/uploads/1/3/4/0/134000249/zasimogifemamox.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/52732c14f3.pdfIn PDF document text
    • http://gobitujesan.scienceontheweb.net/kozofuku.pdfIn PDF document text
    • https://badikixokatapi.weebly.com/uploads/1/3/0/7/130739740/7043897.pdfIn PDF document text
    • https://pexerewiku.weebly.com/uploads/1/3/5/3/135313352/supajobikibo_sokubapukibid_fufal.pdfIn PDF document text
    • https://tusejefil.weebly.com/uploads/1/3/4/3/134320171/5948305.pdfIn PDF document text
    • https://vatanivirasuta.weebly.com/uploads/1/3/5/3/135387760/3627758.pdfIn PDF document text
    • http://numulul.mygamesonline.org/anne_balsamo_technologies_of_the_gendered_body.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_7b3264faece74d9088e21a993790a4ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8443779-58d2-4b29-8143-de1ae9a29362/novena_del_sagrado_corazon_de_jesus_del_padre_pio.pdfIn PDF document text
    • https://c335e157-9962-4e43-983a-f5fcf491c4e2.filesusr.com/ugd/a09b09_0cd5352c8f7242a3aca1856bea67ea95.pdf?index=trueIn PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_9354f6dc6f8e4d3fb47b84df25e47c17.pdf?index=trueIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_c1664d8dc2784c5fb3042c9a060f7578.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_ef8121daff4c460f8ebf77dd7071abce.pdf?index=trueIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_f4516bfcad974a639b9a815b09669228.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f210ea1-c4d7-4852-a6e5-489663aedc1a/kabenag.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_3c782dbffdbe42449fdf7a417fdfa73c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c848b036-d52c-48f7-a9e6-15c6ba5eb780/what_is_the_salary_of_an_electrical_engineer_in_india.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_d6f3a840893a48e792e04b6aa88e7b03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b16ee850-a0aa-4ae0-a2b7-690fc87aefd5/how_to_assess_reading_comprehension.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b78e70-555a-48d8-a302-3b24b4ecbcfc/27290477030.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_off000115da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 5168 bytes
SHA-256: 8b7592b9ee27e1a76871173f3d5b9745133e439c23c5c1d79a941b7d70ab2e2a
font_01_sfnt_off00012783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12783 11280 bytes
SHA-256: ac968effcd9112730ee7baf69e2393267dbfbe6c1ac25cff7e0de6e338de25fd

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