Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7af42c9041eec6…

MALICIOUS

PDF

78.4 KB Created: 2021-06-10 09:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a2733811d92b9564ecf54f6ee1db5928 SHA-1: 58fec189defa91d1facff3825f8aa323cdb645ae SHA-256: 5b7af42c9041eec687981d6bc8c34295af724f56e83268bc177d2aff3c3b5223
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://oniceh.ru/pbw?utm_term=drastic+emulator+download+for+pc PDF link annotation
    • https://ponokexagetax.weebly.com/uploads/1/3/4/3/134326843/4350737.pdfIn PDF document text
    • https://vibejatixulaxa.weebly.com/uploads/1/3/4/1/134131444/4713436e4.pdfIn PDF document text
    • https://ponasamexow.weebly.com/uploads/1/3/1/3/131398296/vufatuwezoram-sewadafa-jumujobupozip.pdfIn PDF document text
    • https://givurarole.weebly.com/uploads/1/3/4/5/134578012/sowuvagusopiwigugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417999/normal_605b1f3e01ed9.pdfIn PDF document text
    • https://judiwufafa.weebly.com/uploads/1/3/3/9/133999980/f4cc12.pdfIn PDF document text
    • https://tuzunogosur.weebly.com/uploads/1/3/0/8/130815213/4327114.pdfIn PDF document text
    • https://vomadepuxu.weebly.com/uploads/1/3/4/7/134700608/3354505.pdfIn PDF document text
    • https://fotavisemaro.weebly.com/uploads/1/3/1/4/131406710/kenunixuxufevudubivi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416131/normal_5fc9f188427f5.pdfIn PDF document text
    • https://xorusisu.weebly.com/uploads/1/3/4/3/134314808/377911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411250/normal_60351e416f35d.pdfIn PDF document text
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/1cbf46b47.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144413406/32757392872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c0d5bc-3d9a-465c-b59e-9b4a911c3a05/how_to_import_bookmarks_to_safari.pdfIn PDF document text
    • http://jaxonewu.pbworks.com/w/file/fetch/144644238/how_to_get_acs_vouchers_in_nyc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa9ed3e-3af4-460a-8675-01d3a24f3ed6/zagodevex.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/f/ielts_8_listening_test_1_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b03d22a-8199-416d-8e19-bbd9e2bd63ae/what_is_chemical_energy_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dcc23a7-d315-423d-8877-1d1f5e1283ba/what_weight_wool_is_caron_simply_soft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc958d3-2066-426f-aad2-40734021e31e/58289415629.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE809 5272 bytes
SHA-256: 910679e614a8f136e6cfbf7aca45e4e1eaa3e35f1b7fc370ee2295adab22086e
font_01_sfnt_off0000f9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EE 10644 bytes
SHA-256: 97dab751fc814e4a274bedaa4de2f5318694c26ef6fc86e3bfb9cbb1d4f27719
font_02_sfnt_off00011e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333