Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e913ce845ad5d1…

MALICIOUS

PDF

72.0 KB Created: 2021-04-05 11:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6a02a9e4164f4635f582f85d9666a861 SHA-1: 758c31938e805fc4d731e800814e1690373f5a66 SHA-256: e4e913ce845ad5d1d63e763f38f3137cbf1d45310dbd992d079e14ca884f00cb
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with several pointing to disposable hosting and exhibiting link farm characteristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://ponafet.ru/award?keyword=additive+inverse+worksheet+pdf PDF link annotation
    • http://xuxijosut.sportsontheweb.net/bolted_connection.pdfIn PDF document text
    • http://grafoanaliz.ru/always_on_my_mind_karaokexu0d4.pdfIn PDF document text
    • http://on-arenas.com/69781330354cy2zp.pdfIn PDF document text
    • http://dejivuxa.mygamesonline.org/pusunu.pdfIn PDF document text
    • http://copyrightreports.com/1805486180999ag5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/spotify_premium_free_apk_latest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b2c593c-1f2c-4093-9a2b-bd3f48f86076/nufakinubo.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_672f9b8802a142ba83601543d42a33f5.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_e1bba65ab337411fa3ba60e145708a58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/popilo/57159100492.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/kevexutedelomojomijuma.pdfIn PDF document text
    • http://kagijido.myartsonline.com/memolebuj.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/beats_by_dre_solo_pro_release_date.pdfIn PDF document text
    • http://tibamupebunod.atwebpages.com/chemistry_formulas_class_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f9aaeac-8336-48e2-a25e-89379d722fbb/59332956901.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/59844696866.pdfIn PDF document text
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_c23ea860ea5f431795969cc0b4145ff1.pdf?index=trueIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/87363674352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3542c9a7-a9f2-420b-b057-8ff92a86ffdb/telof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1cc02dc-7353-4a18-83b2-8467bb31055c/before_i_fall_lauren_oliver_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/275f127b-48a0-4a15-b0c5-98be11cbbd78/how_to_light_up_a_furnace_in_minecraft.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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 5092 bytes
SHA-256: dfd7d200137063ddc6d873e14bc3f8f44156d456668e13a64c58057b2803b15d
font_01_sfnt_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 10992 bytes
SHA-256: 41008f282823ca493d1367d4cdefd55759ea3e9ede49ce46aec9cbefa821cefe

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