Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b4a7fc0caf02a5…

MALICIOUS

PDF

111.2 KB Created: 2021-03-30 22:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9429dcfed1e60f2d506e13b8538d50a1 SHA-1: b838906520d09e6760762df6e7812b0b33524542 SHA-256: a1b4a7fc0caf02a5f08e5937f05f85044283550263918c1d5abc722059c7e7a4
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that, when visited, likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to academic search results, suggesting a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/award?keyword=erik+erikson+psychosocial+theory+of+human+development+pdf
    • https://cdn.sqhk.co/navotezive/Yhbifgh/catholic_religion_meaning_in_bengali.pdf
    • https://cdn.sqhk.co/xurakipigub/femhfhf/skyscraper_movie_building_height.pdf
    • https://cdn.sqhk.co/nimuxugemu/jDhiu4H/13774651125.pdf
    • https://cdn-cms.f-static.net/uploads/4469105/normal_60195985ee7dd.pdf
    • https://static.s123-cdn-static.com/uploads/4393193/normal_5ff0b25d52c73.pdf
    • https://cdn-cms.f-static.net/uploads/4385631/normal_604924c674f66.pdf
    • https://cdn-cms.f-static.net/uploads/4455179/normal_6010fdab56a75.pdf
    • https://cdn.sqhk.co/terodekijur/Wokgcje/nobide.pdf
    • https://cdn.sqhk.co/velijituma/dXiiUgf/77961998964.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d22428fc-ae65-4f48-be8a-b3a78d598aa2/79985391649.pdf
    • https://uploads.strikinglycdn.com/files/70434773-76ac-48d4-a585-9bb1ee6ceec1/troy_bilt_storm_2840.pdf
    • https://s3.amazonaws.com/wibadinavosunom/35485675446.pdf
    • https://uploads.strikinglycdn.com/files/a3678f30-7923-4257-89fa-8edd6a1bd1d2/the_chrysalids_audio_chapter_2.pdf
    • https://s3.amazonaws.com/jotizifime/2024107488.pdf
    • https://s3.amazonaws.com/batoragubukepo/rheem_50_gallon_gas_water_heater_price.pdf
    • https://s3.amazonaws.com/xupovobejanam/socomec_ats_400a_manual.pdf
    • https://s3.amazonaws.com/ruzaganog/87507866275.pdf
    • https://uploads.strikinglycdn.com/files/fe3797bc-3694-407a-a912-f53821a16d33/38392428297.pdf
    • https://s3.amazonaws.com/sefukirexuwekij/how_much_is_an_oil_change_for_a_6.7_powerstroke.pdf
    • https://s3.amazonaws.com/numunenoji/jasunijujakexufo.pdf
    • https://s3.amazonaws.com/kozibowisenatu/68882824625.pdf
    • https://uploads.strikinglycdn.com/files/7329ea0a-1120-4baa-9849-81b1f1460bfb/23099919888.pdf
    • https://uploads.strikinglycdn.com/files/431dc4cd-a202-4b79-87e9-5428b529ca5a/33137990456.pdf
    • https://uploads.strikinglycdn.com/files/40b7c59f-73b2-4a43-86e9-e194ab2af236/mojaniromepubudido.pdf
    • https://uploads.strikinglycdn.com/files/278efadc-b806-467f-b675-4b92d9da128b/what_is_the_origin_of_police_in_america.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000171e7.bin
87c240d00cbe31c6861ee9efd91ae8ba53239b90086744e8f1d5a37623ecc019		 pdf-font-stream PDF embedded font (sfnt) at offset 0x171E7 5576 bytes
font_01_sfnt_off000184ca.bin
daa58c3ffd973adcbcc66de50fdcc04b3a8c57a148a91c227522216e9bce37b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x184CA 11900 bytes

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