Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cb0b49b1ae3190…

MALICIOUS

PDF

97.5 KB Created: 2021-04-11 03:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64cddf9e3187b71e39d8b07b378779a9 SHA-1: d464450aec5e2f0f884ad2a8496d9077a5fed14b SHA-256: b1cb0b49b1ae319067c3b0c4d03bf5b8f2dd9d0322ca9865d2bd0fca3b6fbaab
156 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 and an ML classifier indicating maliciousness. It contains a large number of external links, with one prominent link pointing to 'resalured.ru', suggesting a link farm or phishing attempt. The presence of embedded URLs and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=advantages+of+regenerative+rankine+cycle
    • http://wativeb.mypressonline.com/dapozuwibezanoxefu.pdf
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/napogozad.pdf
    • https://zojufagilazit.weebly.com/uploads/1/3/0/9/130969654/dcbe1.pdf
    • https://patewolenapew.weebly.com/uploads/1/3/4/5/134525441/begix.pdf
    • http://prizinsta365.website/potabikofajofopinitibure77e24.pdf
    • https://rifedisivivuze.weebly.com/uploads/1/3/2/8/132814279/famowifi.pdf
    • https://pujezifug.weebly.com/uploads/1/3/0/7/130738771/foluretevunafu.pdf
    • http://instapriz.website/invoice_layout_word_templatejwnq6.pdf
    • http://tusiteguluvora.getenjoyment.net/remstar_pro_m_series_replacement_parts.pdf
    • http://ilkertr.shop/android_studio_rename_project_folderpe6jr.pdf
    • http://verifybadgehelp.com/arch_linux_yay_guidebsqp0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_c55b9742cd9e4b24bd659cd91370519a.pdf?index=true
    • https://s3.amazonaws.com/sixenogafopoj/97404269652.pdf
    • http://bufijonewufo.onlinewebshop.net/child_passport_application_form_australia.pdf
    • https://s3.amazonaws.com/kasuwevovog/xifow.pdf
    • https://s3.amazonaws.com/piradi/delta_royal_4_in_1_crib_instructions.pdf
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_01ee2edcc0c843129fa5d219187dec3a.pdf?index=true
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_632bc16769374a4aac762b14825454d9.pdf?index=true
    • https://s3.amazonaws.com/pazatuv/49151914906.pdf
    • https://s3.amazonaws.com/gavexilatuvitaz/bts_video_call_pro_apk.pdf
    • https://s3.amazonaws.com/mogedozara/78079102042.pdf
    • https://s3.amazonaws.com/venunamazozuzo/18945622025.pdf
    • https://s3.amazonaws.com/doxifuba/email_notification_jotform.pdf
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_deee36c1aef34795924d4b3d99e70820.pdf?index=true
    • https://s3.amazonaws.com/vavebufevodutob/6922828550.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e74.bin
697fcec496fb7e755c17d0546b80f61e15bdf3bc595af359548a9afb70c91dd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E74 5404 bytes
font_01_sfnt_off00015100.bin
a35053ebce657c06d01e7bfdad8ec21f3f9c1df0ca3cf1a396256266511ebebb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15100 11556 bytes

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