Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75ba2c3b77e66a3…

MALICIOUS

PDF

79.9 KB Created: 2021-04-04 17:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9e31deb6a758024d0b4ef010a8d72731 SHA-1: b5a47756437d8bfdb08487aa873199bbb80cf727 SHA-256: d75ba2c3b77e66a3d2c24e4fa0485325f92b9bc244af51fff3f1c11efe8fbc6c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's primary purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=non-+binding+term+sheet+meaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446944/normal_6065a8f3ce076.pdfIn PDF document text
    • http://iminn.ru/harrison_bergeron_kurt_vonnegut_storys2vmr.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/44422475186.pdfIn PDF document text
    • http://wimudevereru.sportsontheweb.net/kuzegikiwumakibelara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495691/normal_5fd3372f4d1c7.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/igvhjhb/electric_drum_kits_for_sale_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/zubejavaxuvu/cKKjjij/bowling_world_cup_results_rugby.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_5fd9f30aa9c05.pdfIn PDF document text
    • http://dakajak.medianewsonline.com/wafemu.pdfIn PDF document text
    • http://septiki-rf.website/spinel_images_steven_universer2n33.pdfIn PDF document text
    • http://dabinepoj.mygamesonline.org/download_annotator_crack.pdfIn PDF document text
    • http://expressday.online/905780889015h5yw.pdfIn PDF document text
    • http://indonesia2health.online/ielts_academic_writing_task_1_ielts_buddyltrlo.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
    • https://s3.amazonaws.com/lanubili/free_price_guide_for_pokemon_cards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6a4825-d6ca-4cbc-b585-170d56365c1a/40143647622.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/juvefuwej.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/76206324930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0993f93-5914-4025-8aa1-3d4278a80d18/2008_honda_civic_hybrid_service_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/35793439168.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_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 5136 bytes
SHA-256: def366f363cccd1e4462daf2748cf147c059cb895250b5727346480fea793209
font_01_sfnt_off000100bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 10480 bytes
SHA-256: d4a709f2fa047c169c3266ea625ac625c93e4767944b8e7fad4da92be3c1543d
font_02_sfnt_off00012469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12469 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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