Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdecd39ff675aeb…

MALICIOUS

PDF

79.1 KB Created: 2021-03-23 22:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2ff32d7e3767f563f8b6e096928daf21 SHA-1: 0a4546c0e2b1f8015b9d05ba3f1bb3d392147f3b SHA-256: efdecd39ff675aeb39205ef7b339244153a5df77149255bf89cf8a27c9e1314b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to obfuscate the redirection or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/strik?utm_term=a+christmas+carol+characters+quizlet PDF link annotation
    • http://hhizmet.com/simple_literature_review_example2vy3t.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/tutiwewaguwarib-bibesiwirus-butuduva-pafamo.pdfIn PDF document text
    • http://giftcard-sale.store/40153152977ywtur.pdfIn PDF document text
    • http://saburogamo.iblogger.org/98775765348.pdfIn PDF document text
    • http://vorecan.fun/fagilibiwovikoj1u9n.pdfIn PDF document text
    • https://letirunexogono.weebly.com/uploads/1/3/4/3/134315181/1489054.pdfIn PDF document text
    • http://aydym.club/how_to_replace_a_dehumidifier_filtern3vrd.pdfIn PDF document text
    • http://sikutamilom.iblogger.org/swot_analysis_apple.pdfIn PDF document text
    • http://top-agent.ru/download_manga_tokyo_ghoul_re_batchcqiz8.pdfIn PDF document text
    • https://mazazujusuvazix.weebly.com/uploads/1/3/1/8/131856432/lawuzudebutu-gimupoli-bifadil-lisijo.pdfIn PDF document text
    • http://podipotekoi.ru/what_does_neuromuscular_incapacitation_meanrtxun.pdfIn PDF document text
    • http://thedefenseforge.com/mental_status_exam_formge3ge.pdfIn PDF document text
    • http://kulibakux.iblogger.org/78989973392.pdfIn PDF document text
    • https://livupojinobiz.weebly.com/uploads/1/3/1/8/131856358/6095701.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/564583807565feea.pdfIn PDF document text
    • https://vaxevadokipab.weebly.com/uploads/1/3/4/6/134610393/zobimumodopu_fomukuxefu_fowobefijav.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://kafafisizufol.rf.gd/socket_programming_in_python.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25dfdb58-0dfa-41ad-8e65-82fe99977fb1/gozik.pdfIn PDF document text
    • http://fexeledusezeto.rf.gd/bidavavivujape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec3d18cd-cadb-4529-94fa-57b2fe0cc43c/26836915047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1baa4d10-371b-4da0-b025-76d2ac292de4/how_do_i_control_my_soundbar_with_my_apple_tv_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d5235f-239d-4380-ba8d-2bcaf2381ea2/what_is_conflict_resolution_in_nursing.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_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 4980 bytes
SHA-256: 9f646d055d52b5627e1d2a7e639e925109a47f20344c11881c37b7974bf79743
font_01_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 11908 bytes
SHA-256: de1d71b4861ecf2b50b6ada422f8f4d85d4f39111cff7e4e8b1c47c750f84ac3
font_02_sfnt_off0001204d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176