Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ea1c1a31cdebb2…

MALICIOUS

PDF

80.5 KB Created: 2021-03-18 02:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f452865c648e0027f8ee72de99bc3da3 SHA-1: 2e941bc1a0979ec883f46010b9b089c1c5760074 SHA-256: 72ea1c1a31cdebb2bea468e1c3168acc5eaa1806a648ae3787481766794f930f
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs pointing to various domains, many of which are hosted on disposable or suspicious-looking domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, a common tactic for phishing or distributing malicious content. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/wix?keyword=pokemon+alpha+sapphire+legendary+guide
    • https://marelepo.weebly.com/uploads/1/3/0/7/130738501/kekukedopopoxupumek.pdf
    • http://freshka.fun/4275645867vvgqx.pdf
    • http://zosuwalerikare.getenjoyment.net/numerical_analysis_mathematics_of_scientific_computing_solutions.pdf
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/357769.pdf
    • http://reform-st.ru/xosamly14d.pdf
    • http://getcabinets.xyz/22385224509fyppv.pdf
    • http://apelsins.space/my_appearance_worksheete8uet.pdf
    • http://shop50off.info/hard_boiled_egg_diet_plank8o7y.pdf
    • http://zabovawupe.mypressonline.com/guzigijure.pdf
    • https://najigojuvunijo.weebly.com/uploads/1/3/0/8/130874658/1611402.pdf
    • http://edalovert.xyz/bugeditavizeskrxq2.pdf
    • http://mapotilij.mygamesonline.org/child_and_adolescent_mental_health_a_practical_all_in_one_guide.pdf
    • https://duvugegigoga.weebly.com/uploads/1/3/1/4/131409055/980392.pdf
    • http://biomaniks.website/95621096124ejbqp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/timituvupame/97370852503.pdf
    • https://s3.amazonaws.com/gafedupeba/hampton_bay_ceiling_fan_glass_globe_replacement.pdf
    • https://s3.amazonaws.com/pogolo/86754750193.pdf
    • https://s3.amazonaws.com/pokixovuxik/mizibenin.pdf
    • https://s3.amazonaws.com/kaxukok/bentley_home_sheets_1000_thread_count_sheets.pdf
    • http://mepitar.atwebpages.com/avitaminosis_book.pdf
    • https://s3.amazonaws.com/rijaliwiguvex/5348283045.pdf
    • http://suxudogakol.myartsonline.com/design_of_astable_multivibrator_using_555_timer.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_off0000ef27.bin
bd60b35c9f4b0e7bf7c8b8c0c465105576a8a8a8c1327061d34827297c39922d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 5340 bytes
font_01_sfnt_off00010118.bin
e94afa7764f292d8f772c672811cf6c5a4ed4020a4a1dae2bb9a16e063498653		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 10360 bytes
font_02_sfnt_off0001245b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1245B 4324 bytes

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