Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4d3a279d4bbe8a…

MALICIOUS

PDF

83.6 KB Created: 2021-03-20 22:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2dd4d0d5e28d5206d1204fc3c913676d SHA-1: 547451d8b7a6f576dca8d7a3d812d389dd8a15a6 SHA-256: 8e4d3a279d4bbe8a082b9179af111cd533aa65416fe4fc86a8cc29fbb311e277
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 0.9995

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://gimoguvi.ru/wix?keyword=younow+mod+apk PDF link annotation
    • http://fedajoxoxa.iblogger.org/54864552898.pdfIn PDF document text
    • http://potusowo.22web.org/vatixokirusabakexubot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_604d9e75b846b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416144/normal_5ff01561a20ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_60127a5808d86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390329/normal_5fc98bae60335.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://pepebejawu.epizy.com/lumemevexowatiditofoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b7905e-57d8-4617-b258-0fed05e7edd0/how_to_stop_first_alert_fire_alarm_from_chirping.pdfIn PDF document text
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_3a03da880cb64d5db5d841fb1c4ea371.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b7e541-acb0-4320-ad7f-fc7f894846e6/hp_pavilion_dv6_drivers_for_windows_7_64_bit_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ec4b724-d9ca-4bc7-b7ff-60f3a9371b03/amar_chitra_katha_ramayana_hindi.pdfIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_3ee2f59fac854271a5555387bfc13bbe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a39e2690-6d7c-4509-831b-0a3a6e49ebf3/gidakijugulidofisowosewi.pdfIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_5e62d7e66330470f8dbdd5766e60ee8b.pdf?index=trueIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_889dfa5a63014b48a3ca9c3ceff06a6c.pdf?index=trueIn PDF document text
    • http://mutuwosamitev.rf.gd/graphic_novel_books_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/923f2018-bbe0-4c5c-8d6f-c92c156674bc/el_pollo_loco_allergy_menu.pdfIn PDF document text
    • http://reratosagozi.rf.gd/47740394109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964cb6a3-01e3-4935-a905-054273b420d8/black_and_decker_jigsaw_parts_uk.pdfIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_adf093e65d344283a7be777cefc08a34.pdf?index=trueIn PDF document text
    • http://wipidomi.rf.gd/lagu_op_blend_s_versi_dangdut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/132268f2-4ed3-4878-a49d-df80d3534e6d/how_to_fix_delta_shower_knob.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_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 4552 bytes
SHA-256: bf77a14de4debb09deab2d659116956ae32a7e305ba9f530c4326d4ea091b5f1
font_01_sfnt_off000101bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 19636 bytes
SHA-256: 37d5c2039f47d9b61f99ae2ad4442ce5e3a029d1a6d1bd9148a73ab62ab32fd3
font_02_sfnt_off00013352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13352 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361