Malicious PDF — malware analysis report

Static analysis result for SHA-256 caddd91a0a9ef416…

MALICIOUS

PDF

72.7 KB Created: 2021-03-16 15:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5850808ce8d9d152955166d28d35bd5 SHA-1: d7aaa894251770c65ed388e1b23fdbb9c1b4aed5 SHA-256: caddd91a0a9ef41651c70f9d6c2e0700b01335a0e8c35f2cacb63f2ca3cf23be
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to disposable hosting, strongly suggests a link farm designed to redirect users to malicious content. The ML classifier also indicated a high probability of maliciousness. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution campaigns.

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://ponafet.ru/wix?keyword=spyzie+apk+cracked
    • https://cdn.sqhk.co/rekutadis/Gliijep/xaxojibuwodufilola.pdf
    • https://cdn-cms.f-static.net/uploads/4501656/normal_604cec021aec6.pdf
    • https://cdn.sqhk.co/metexemoraga/PjihjIB/carson_city_school_district_jobs.pdf
    • http://jinevul.mygamesonline.org/what_is_the_main_message_of_the_gettysburg_address.pdf
    • https://xuzelete.weebly.com/uploads/1/3/2/6/132681171/21af1.pdf
    • https://cdn-cms.f-static.net/uploads/4467927/normal_600d40f1012e9.pdf
    • http://lejifip.sportsontheweb.net/ruferesoritefawi.pdf
    • https://ruxabetuju.weebly.com/uploads/1/3/2/7/132740595/53968c3af50.pdf
    • https://cdn.sqhk.co/dinigivo/giehbd9/from_farm_to_city_dynasty_apk_mod.pdf
    • https://cdn-cms.f-static.net/uploads/4504922/normal_6039efcd4a5e6.pdf
    • https://static.s123-cdn-static.com/uploads/4446782/normal_5fcb765a662ca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pujumek.myartsonline.com/69117152520.pdf
    • http://jumepenitujox.atwebpages.com/phonetic_alphabet_military.pdf
    • http://vekejuf.atwebpages.com/how_to_adjust_temperature_on_galanz_mini_fridge.pdf
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_9891031c324f456a947624a234b290ca.pdf?index=true
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_5818f7fda4de4022adfd7fdc42700ee8.pdf?index=true
    • 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_off0000d2cf.bin
837e02e0389a470a6abb37abb06732b27c0e1e3a551661626a7bfb6af1c4492f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CF 4668 bytes
font_01_sfnt_off0000e2c3.bin
718187b43a7231e72d0d9bcd03882b0ca89731d99cecda041d90c17b249415f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 10844 bytes
font_02_sfnt_off000107f6.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 4324 bytes

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