Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a206f81a132b59…

MALICIOUS

PDF

76.0 KB Created: 2021-03-16 15:29:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9593ff06867c579aa0390f9ff7067245 SHA-1: 7b86f41922cc86f2ffd2fcd2f41d8daaf9788fc9 SHA-256: c5a206f81a132b59647895fd6dd28c726f183e1fc5cb3f4daa29dc7d862d78ac
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/strik?utm_term=lord+of+the+flies+study+guide+answers+chapter+9-12'. The document body, though heavily obfuscated, suggests a lure related to a 'Lord of the flies study guide'. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/strik?utm_term=lord+of+the+flies+study+guide+answers+chapter+9-12 In PDF document text
    • https://cdn.sqhk.co/pifixijowoka/79gePWP/zedilinibadezewaliwawida.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5fcb0caf05967.pdfIn PDF document text
    • http://begdas.space/is_a_revolution_coming_20200qfog.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/Mz7Mjhg/beat_stomper_unlocked_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_60298be24b39d.pdfIn PDF document text
    • http://mastericy-chistoty.ru/bafuzotexofogasaxevt2s8i.pdfIn PDF document text
    • https://cdn.sqhk.co/purijiralug/gHiihap/68063360069.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/TXjjNK4/cbs_sports_fantasy_football_running_back_tiers.pdfIn PDF document text
    • http://magnitoli-2ekran.site/south_carolina_driving_permit_test_practice7fd1c.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/MFheqif/como_descargar_hungry_shark_evolution_hackeado_pc.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/4d5d0e9f-5447-4be9-ad73-e3952d274b60/todelek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/124da6a0-e166-43e8-9f05-4ec252b973b7/nikamakekixekirep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ff0f92-1f28-4b79-9a57-7e74b6784252/93665480762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2f2a11b-6653-4afb-9afa-d924d19c1091/what_is_a_textured_ceiling_finish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f592ba0-c0d7-4297-bef6-9161f54bc63f/what_place_is_galar_based_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7f7b19a-c6a0-4006-a474-1cf91e0f5ed8/lefefotisigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e628fb95-c3c6-4c91-a7b7-39875718b082/spanish_present_tense_verb_practice_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc79489c-dbfb-4f8e-9399-c9662ad70b1e/tesesikizevukewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ef1cb8-2029-495b-a16a-e3838a78d032/38433264545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcd1fa31-352e-4bd3-bbf1-31a6d8acb9e1/73896679206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48baa106-990a-4795-97c9-7643a5cae667/xixewukusosakuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a1ff2f-7fe5-452f-b238-5c916281e851/how_to_get_a_stall_at_muizenberg_flea_market.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57274c34-cdc4-4f64-b339-670703916e36/gevezofolitaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a56989d-4de7-465b-b317-0f342618f08b/what_are_some_signal_words_for_description.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_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 5924 bytes
SHA-256: 6ab13951c1ab0591a56b1c53b963b159879a261f89c7834ba0a596e9955e75be
font_01_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 10432 bytes
SHA-256: 2ab0e869b2b25981d89a7023c7f6b6bebb35803781e09a12c404173e77690ac8