Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc142b203cf2cb1d…

MALICIOUS

PDF

78.1 KB Created: 2021-04-07 10:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4457373f837b7497593a7f8c1b1ee8b4 SHA-1: dc8e26cf96072b657bf4e7b9b5ca53307f79b936 SHA-256: bc142b203cf2cb1de55b944e4fb2e6c292a000b7e05e0415ac663d2059243ad6
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ML classification and ClamAV detection strongly indicate malicious intent, likely to phish or deliver a second-stage payload. The document body, though heavily obfuscated, contains metadata suggesting it is a PDF disguised as 'lyrical ballads preface'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/123?utm_term=lyrical+ballads+preface+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465142/normal_606c23960e4df.pdfIn PDF document text
    • http://lorubuxetorifa.medianewsonline.com/ponirevifexeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_6064d9a305825.pdfIn PDF document text
    • http://usacarins.com/american_history_workbook_answersh070q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390373/normal_5fe35db572bf9.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_601ec7d70370a.pdfIn PDF document text
    • http://vexizudu.medianewsonline.com/sistema_capitalista_y_socialista.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471995/normal_5ff1452badbed.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/72658473255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424330/normal_603ea7842ee20.pdfIn PDF document text
    • http://importants.space/cupshe_bikini_size_guideuaqh1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_602a41b18b866.pdfIn PDF document text
    • http://emirofficialzm.com/penguin_reader_beginnerm2b4v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb1509b-a754-4ead-b670-487238e38305/2008_dodge_grand_caravan_sxt_electrical_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3a556d-90f8-411e-ba18-c934b5fa979f/bhagavad_gita_chapter_2_verse_54_meaning.pdfIn PDF document text
    • http://rabelinowizufe.myartsonline.com/jadog.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/why_does_my_apple_music_keep_disappearing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bacb9cad-83d9-4b8f-9d7a-d0fed22298c5/how_to_enter_gerudo_fortress_as_a_kid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e21d3b9-b06b-4ac8-8f39-7feed9070446/bagopiz.pdfIn PDF document text
    • http://girofili.myartsonline.com/igloo_countertop_ice_maker_machine.pdfIn PDF document text
    • http://suxazetevuzo.onlinewebshop.net/vuwexorupodevajinopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c224ea-1da1-4fc2-a1d0-fb7eff029377/whats_better_mink_or_russian_lashes.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_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 5332 bytes
SHA-256: 33891ecc3b9a74b3af73e152369627692e5dced7c78eb20ab75028807108c920
font_01_sfnt_off000104ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 11312 bytes
SHA-256: 21edd0925b646ac0dc784743939d3a6a08fff8f460e40a7465f5bee39287a4c5

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