Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7d75adb84b27e2…

MALICIOUS

PDF

81.6 KB Created: 2021-04-11 18:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6814b33846129e0bf16b3dfb346cc3ed SHA-1: 708f59f6541de8a38c19d58e09a892bd1737a598 SHA-256: 7c7d75adb84b27e2af3998266c02c77aa624e7c070f8b1fdbb704ba0c929f166
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to unrelated documents, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=phonemic+awareness+lessons+for+preschool
    • http://dawezedelofeda.scienceontheweb.net/wiwipore.pdf
    • http://pogawubujogeje.mypressonline.com/20058489546.pdf
    • http://tozidak.mygamesonline.org/mini_international_neuropsychiatric_interview_italiano.pdf
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/nukexamusuzo.pdf
    • https://daxugukixirujin.weebly.com/uploads/1/3/4/7/134739014/wotagubim_megexidifurop.pdf
    • https://nibowivuxewanu.weebly.com/uploads/1/3/1/3/131379040/57f97.pdf
    • http://pugorot.mygamesonline.org/is_the_lg_stylo_a_good_phone.pdf
    • http://puwokewekiful.iblogger.org/jurnal_media_audio_visual.pdf
    • http://nadugavuwitaleb.iblogger.org/33869517089.pdf
    • https://xoruvuxana.weebly.com/uploads/1/3/2/6/132696063/169758.pdf
    • https://nakigere.weebly.com/uploads/1/3/4/6/134608851/6045686.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dakamonegip.rf.gd/affirmative_action_policy_in_namibia.pdf
    • https://uploads.strikinglycdn.com/files/262fa18b-5e0a-47be-ba1d-355961477e4c/63553022868.pdf
    • https://s3.amazonaws.com/defipedibe/vofelabuv.pdf
    • https://s3.amazonaws.com/bufexa/performance_parts_for_honda_cars.pdf
    • https://s3.amazonaws.com/baxekojojexusol/xewirofusufar.pdf
    • https://uploads.strikinglycdn.com/files/93977649-9f7f-4afb-8542-9d6f7cb49f45/vocab_workshop_level_c_unit_3_answers.pdf
    • https://s3.amazonaws.com/gavobawum/2004_sienna_oil_capacity.pdf
    • http://nakepusigazu.epizy.com/mortgage_pre_approval_letter.pdf
    • https://uploads.strikinglycdn.com/files/87b5d61a-a642-415e-80e5-e900092fff16/formato_de_entrevista_semiestructurada_para_docentes.pdf
    • https://s3.amazonaws.com/pubopelej/diwatiruxuliba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f360.bin
0a2237cfd3259226ff8c85d3a16556d2e0ce84ce302d5e642402c00c79c88ada		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 5056 bytes
font_01_sfnt_off0001045c.bin
3072134474a69c9ee1330d0be50efea4bc6606847c436298029e8c813e742278		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 10752 bytes
font_02_sfnt_off00012908.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12908 4324 bytes

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