Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4e825173d9ae2e…

MALICIOUS

PDF

77.4 KB Created: 2021-03-29 04:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc4794e110f1bc0b6bf01f21c00722b0 SHA-1: 5ef981f9ea5ab7e9b02d8d5be6b2c598d91f92c3 SHA-256: 1f4e825173d9ae2e39c7ec0ba2f74ee7883a01bdec61ef508f15c4e68232aa27
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The document body, though partially obfuscated, appears to be a lure related to medical information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=how+do+you+permanently+cure+piriformis+syndrome
    • https://cdn.sqhk.co/palevisi/ptXHjgA/war_machines_tank_upgrade_levels.pdf
    • https://malufatagu.weebly.com/uploads/1/3/0/8/130874424/fukufitirufutil-birajotivamujok-welafufeje-sagexusapir.pdf
    • https://joxegozul.weebly.com/uploads/1/3/1/0/131070165/jirojak-puxelibow-subanut.pdf
    • https://cdn.sqhk.co/zekuxemelop/9Aicghi/71378887341.pdf
    • http://dulomagukide.22web.org/sopafigidalaki.pdf
    • https://cdn.sqhk.co/tosijoxopum/rmZLwjd/gold_runner_alpine_coaster_hours.pdf
    • https://depasosuva.weebly.com/uploads/1/3/4/4/134483816/xaxovawevazemeji.pdf
    • https://cdn.sqhk.co/bujavenizake/gjKhgjb/vubibales.pdf
    • https://zepiwifolu.weebly.com/uploads/1/3/5/9/135965208/wononukazujet_semajovemut_xifij.pdf
    • http://femokotafi.66ghz.com/latiwarowelekevanepu.pdf
    • https://xodimazu.weebly.com/uploads/1/3/1/4/131408168/93ebeff3742138.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_78fd7243e8984cfb94789bf1f86f1db0.pdf?index=true
    • http://pubitawiwinas.rf.gd/weather_app_free_for_android.pdf
    • http://xupewosupegosax.epizy.com/the_art_of_choosing_book_summary.pdf
    • http://pisumapopub.rf.gd/jurefo.pdf
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_ae199bde029e434a981816a440b3a3a1.pdf?index=true
    • http://lewimidofi.epizy.com/34649069725.pdf
    • http://zovagupegi.rf.gd/just_already_yet_exercises_with_answers.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_off0000f0e1.bin
28055703ceb338e69bfda3e1f48fc95010bb658ecbf4897e0478f570019c5b79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 5456 bytes
font_01_sfnt_off0001036f.bin
c78e8dc074b7352ae6abb0c559da1279ea892626adc14a1c5657da96548d7eca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 10672 bytes

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