Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aaf775858d123a9…

MALICIOUS

PDF

77.7 KB Created: 2021-03-05 02:05:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: dbd04e32874fd2f125c7da31d9238913 SHA-1: 1a54089ec50242d71af44e574d563b610de736f1 SHA-256: 7aaf775858d123a96ab835bf76da20b1dd6a4c72a97c89e969c94e5b4e5a9b7d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains a heuristic firing for 'LOLBin token sequence in document text' which suggests the execution of commands, potentially involving PowerShell. Additionally, it embeds multiple external URIs, with at least one, 'https://xajibur.ru/strik?utm_term=it%2527s+dead+in+the+water+definition', being a suspicious domain likely used for phishing or malware distribution. The presence of these indicators strongly suggests an attempt to exploit the user or deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://xajibur.ru/strik?utm_term=it%2527s+dead+in+the+water+definition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473640/normal_6030265b48a21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446260/normal_5ffbeae821aba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_603ee01928751.pdfIn PDF document text
    • http://rat-red.space/geeksforgeeks_dynamic_programmingaeu0n.pdfIn PDF document text
    • http://civiliscmq.online/jeridanefonalisosomu6szf.pdfIn PDF document text
    • http://mylic.ru/nofadujujanunisexyxqk.pdfIn PDF document text
    • http://smartradiobf.ru/baxujifozirokafes2pazf.pdfIn PDF document text
    • http://energytik.net/how_to_write_a_letter_of_explanation_to_the_board_of_nursingh8up4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491412/normal_602d9e218cac9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475716/normal_5ff2095b515f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485299/normal_602d59a1c3eca.pdfIn PDF document text
    • http://cloudmarket.website/70034370062f9jvq.pdfIn PDF document text
    • http://idealica-italiaofficial.site/windows_powershell_ise_download_windows_8.1gzwkq.pdfIn PDF document text
    • http://reduslim-officialsite.site/backstab_mod_apk_2018u5r9t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482848/normal_5fe787bfea584.pdfIn PDF document text
    • http://smartbright.club/5566183567cq66r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_601ab77d32e98.pdfIn PDF document text
    • http://instapriz.site/14411016980c8xrb.pdfIn PDF document text
    • http://reduslimIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bubeto/basic_computer_hardware_free.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_229d038d62ad4273838a0ed0cecb7350.pdf?index=trueIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_59a370b658df4459ad881f81afc6690d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarajix/5_week_pregnancy_scan_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/whirlpool_duet_washer_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/reporting_anova_results_from_spss.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/kulinisokakewi/betulutebemezerujizupekaf.pdfIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_23fc191a8ec948f0bcc26f6cac557d56.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_e8766df9bf004a9ba4d6bfb92e966d76.pdf?index=trueIn 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_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 5028 bytes
SHA-256: 7f32b653f6e8477526f2240d4cf53740f5190e42e966489a55a663c8b184f7c6
font_01_sfnt_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 10852 bytes
SHA-256: b5c5067b55b11c7c12f3fb40f7c88643383d70663876928b1af1ed0aac8a52f1

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