Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db7538b3cbfbaaa…

MALICIOUS

PDF

153.8 KB Created: 2021-03-12 19:59:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ecae1d7f27debbabd1d57fd7e3a52dff SHA-1: 2247636b3551cb2ec6b64c38cf2948bf4972f122 SHA-256: 9db7538b3cbfbaaab24a9873c92d36a7b1ec24d803769016980786fedda21f97
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a URL that appears to be a lure for downloading further malicious content, disguised as a GRE word list. ClamAV and ML classifiers have flagged this PDF as malicious, indicating a phishing or trojan payload. While no scripts were directly extracted, the presence of external URIs and the nature of the detection suggest an attempt to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=gre+word+list+with+antonyms+and+synonyms+pdf PDF link annotation
    • https://cdn.sqhk.co/zukasedu/udharie/vuwudiwan.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/ejjU0ie/hero_xpulse_200t_review_quora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527164/normal_602630a83c59a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402706/normal_601b2a88bbc5a.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/giH1jdo/space_racing_star_race_mod_apk.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/586b50ef-ed4d-4594-b6ad-3203c88054da/6364664364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e3e0f6-9de0-4b33-b1b2-67bdfd1ef228/lg_top_loader_washing_machine_drain_pump_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4b999d-4c8a-42dd-a812-d1f292cfb6a0/why_should_i_recycle_lesson_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e747c9-0c27-47a0-a047-2eaaa00f61fa/47935856095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1f234f-d345-4481-8781-b138bc91e288/bissell_turboclean_powerbrush_pet_carpet_cleaner_shampooer_2085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c63ae12-d664-4da3-8cc9-cdcdb96f78fe/velofugapejirapajuwubebax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/288b4eb0-ad04-4550-b40e-d15d10a065b5/27948920716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e1226ef-f723-4b1f-8d2b-3a6161a8643e/14465774233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/427a4b09-9e79-4e9c-a0e8-f5aabb2e7fac/how_to_clean_dryer_vent_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d579d421-2dc1-4c2b-8356-ff194d190d8a/new_york_state_map_staten_island.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4bf360c-e0d6-460e-9052-e0cc75b953db/gifawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04f3d189-1cce-4286-b338-4647bec17aeb/who_sings_the_road_less_traveled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b24829-1bd9-4080-b7e2-223f6bbc03d3/allison_transmission_codes_2003_31.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_off00022247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22247 5504 bytes
SHA-256: 9e855e70a1563716a052df02322587c21e702cfeb67c033ccaeaaf1038d97809
font_01_sfnt_off000234ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234EE 10704 bytes
SHA-256: 8d3dfb38b6259671558dda75bce39d73ccab646512dd5b0f642c66cea8dcb309

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