Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f2ed8ef6d716a6…

MALICIOUS

PDF

88.4 KB Created: 2021-06-06 09:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 410c5ef0ef3d174e49ba2665954cf3e9 SHA-1: 480857188ea08de1fa7a28ad8424860b5e16c964 SHA-256: b2f2ed8ef6d716a6c90315d21a5040b8a8803cd58cdaee26d25c464b56c6df10
186 Risk Score

Malware Insights

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

The PDF file contains a link farm strategy, directing users to multiple external URLs, one of which is `https://chcial.ru/pbw?utm_term=descargar+tres+veces+tu+pelicula+completa+por+mega`. This URL, along with others, suggests a phishing or malware distribution attempt disguised as a movie download. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://chcial.ru/pbw?utm_term=descargar+tres+veces+tu+pelicula+completa+por+mega PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498882/normal_600d1b9241d6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483071/normal_5fd87fff5936b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405687/normal_5fee70f0623e3.pdfIn PDF document text
    • https://dapinolun.weebly.com/uploads/1/3/4/7/134762022/7877115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_5fd67cca9237e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446636/normal_602d6c0d28e12.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4405945/normal_60b783b2377ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451229/normal_60658d9bf2cf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476939/normal_6022a05230726.pdfIn PDF document text
    • https://nubavusixid.weebly.com/uploads/1/3/5/3/135348304/b1d21590f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457332/normal_6062384a3f988.pdfIn PDF document text
    • https://zanelonovubut.weebly.com/uploads/1/3/4/3/134315015/fokofuxog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_60307ef1c3eb2.pdfIn PDF document text
    • https://tuvepovuno.weebly.com/uploads/1/3/3/9/133997374/4542858.pdfIn PDF document text
    • https://rajuwirorevub.weebly.com/uploads/1/3/5/3/135306937/17dbd1.pdfIn PDF document text
    • https://fowedejuman.weebly.com/uploads/1/3/4/5/134518602/nesujufe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/37f62254-6464-4193-99d5-9e385e5d5e38/little_house_on_the_prairie_season_3_episode_2_bunny.pdfIn PDF document text
    • http://nosegawibaso.pbworks.com/w/file/fetch/144516840/90688323215.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/f/pert_math_practice_test_with_answers.pdfIn PDF document text
    • http://zuxanoguk.pbworks.com/f/49655450941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51576423-8786-4b3e-8bc1-c6dddef59bbc/basic_mechanical_engineering_equations.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/w/file/fetch/144517026/vuzuzamiparu.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/f/hunger_games_book_2_google_drive.pdfIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 6440 bytes
SHA-256: edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
font_01_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 5312 bytes
SHA-256: 3e52daa8f46a56c9395d67d2f2bd357b509079f055a4b337f251811bee5d4d45
font_02_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 13396 bytes
SHA-256: 41378f11e30b70832ab2adad5e3fb6bbb19d6a5029e87a8e0b3f19acbc66763f
font_03_sfnt_off00013a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A25 16948 bytes
SHA-256: 7b91941688e7354f3437e027c4deb04aa2640cfb935733f7511f63d15a646045

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