Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34eda1c1f39792e…

MALICIOUS

PDF

73.6 KB Created: 2021-01-26 16:15:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7d988ae359640e1a1881534c3412944f SHA-1: 6c4901d51e02123c575e5ff466f5210d032070a8 SHA-256: c34eda1c1f39792eab8c51bc117b5b8b5710316c586797e4cac227b9aa2bad27
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL pointing to 'jacksth.ru', which is flagged as a link farm and associated with phishing. ClamAV detection and ML classification strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Bricks breaker puzzle level 305', suggesting a lure to disguise the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wb?keyword=bricks%20breaker%20puzzle%20level%20305 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451941/normal_600077365bf92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_5fdc26697fdc6.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/jfmgfk4/destroy_stuff_in_minecraft.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/zuxadorebesov.pdfIn PDF document text
    • http://agnewjacobs.com/outdoor_family_movie_night_ideassb3ub.pdfIn PDF document text
    • https://cdn.sqhk.co/fagojefavap/hfhhgc3/rezunakow.pdfIn PDF document text
    • http://kieverts.xyz/faily_brakes_2nkibi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501963/normal_5feef58da8bcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391649/normal_5fde3c1bebe96.pdfIn PDF document text
    • https://napokepuwaju.weebly.com/uploads/1/3/1/1/131164128/refibagogedavemavi.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/a1bc83b5f28d.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/hgjbhbp/hitman_2_ps4_walkthrough.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_5fea31df35059.pdfIn PDF document text
    • https://fukidupedogof.weebly.com/uploads/1/3/2/8/132814182/5210170.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/hibghgc/download_wild_blood_apk_data_highly_compressed.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/3037251.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE353 5720 bytes
SHA-256: 12bdd45679b92906a730989fa53b6086befbdbdea8a764e7aac7c8a4461ee380
font_01_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 10176 bytes
SHA-256: 2d4fe05be2eb3b4c0bc25ff1094a61682766172d6d7a8b9ca72f36190807a42c

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