Malicious PDF — malware analysis report

Static analysis result for SHA-256 384bff058efd3341…

MALICIOUS

PDF

82.3 KB Created: 2021-03-29 01:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d530df75d1a2c5bb1e89a869183bf029 SHA-1: 6cde86c1170fa340a1f07598c07b66c12ca85664 SHA-256: 384bff058efd3341c8e94b178ca37bbc84c0b672c78b18ab885e6ecbe6782915
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. The embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=lifesmart+infrared+heater+reviews PDF link annotation
    • https://jimekomu.weebly.com/uploads/1/3/1/4/131453536/gujikogunen-wisavuzawujavok-xidinaximujiz.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/is_20000_leagues_under_the_sea_a_childrens_book.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/buvizisasadexaduv.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/68461283506.pdfIn PDF document text
    • https://bajomunimiru.weebly.com/uploads/1/3/1/0/131070213/d8901ec60.pdfIn PDF document text
    • http://bapadama.medianewsonline.com/4_color_personality_test.pdfIn PDF document text
    • https://nadusada.weebly.com/uploads/1/3/0/7/130740262/8777575.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/tecnicas_de_aprendizaje_colaborativo_barkley.pdfIn PDF document text
    • https://mixuzurul.weebly.com/uploads/1/3/2/3/132303374/lewafovegemo.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/lg_washing_machine_repair_hotline.pdfIn PDF document text
    • https://panelaxefejavej.weebly.com/uploads/1/3/5/3/135306159/levalorodixog.pdfIn PDF document text
    • https://zupevinar.weebly.com/uploads/1/3/0/7/130739631/xewixowivagom-mozazopuxafet-giraduroduxat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dusalotiwuje.rf.gd/ccnp_security_firewall.pdfIn PDF document text
    • http://kavagisere.epizy.com/alfa_cetoanalogos_de_aminoacidos.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/nelalapetuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/life_skills_reading_comprehension_worksheets.pdfIn PDF document text
    • http://lexekuduwowig.atwebpages.com/fetimelazopevadulolazaz.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 4888 bytes
SHA-256: 77c61d213683e2e3fe97aab3c983cda3441ae01ad2126cb2dc6d24f051387c92
font_01_sfnt_off00010906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 10780 bytes
SHA-256: 139ae18ee0d51770954f4a1012d37a17c7768734b61396eedd2d350485ece932
font_02_sfnt_off00012d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D57 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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